Durable Moving Boxes

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage

Durable, double end, double bottom construction.Constructed of strong 32 ECT B-Flute corrugated.Easy set-up—no tape required.Lid ships attached to prevent lid loss, then tears off for use.Easy carry handles.Reusable and recyclable

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Fold to your desired size! No carton sizer required..Box sides are scored at multiple depths to allow easy height adjustments for a perfect fit..Save space and money by reducing the number of different cartons in your inventory..Use the right sized box to reduce your costs with parcel services..Made from strong, ECT-32, kraft corrugated.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Designed for maximum strength and protection, these heavy-duty shipping boxes are ideal for transporting heavy or fragile items. Made with robust triple-wall 90 ECT corrugated material, they offer exceptional durability and resistance to crushing, making them perfect for demanding shipping environments..These Boxes are the industry standard!.Boxes ship and store flat to save space..Whether used in industrial, commercial, or warehouse settings, these boxes ensure your contents stay safe and secure throughout transit..These Boxes are the industry standard!

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Fold to your desired size! No carton sizer required..Box sides are scored at multiple depths to allow easy height adjustments for a perfect fit..Save space and money by reducing the number of different cartons in your inventory..Use the right sized box to reduce your costs with parcel services..Made from strong, ECT-32, kraft corrugated.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Quality standard strength industrial Corrugated Boxes..Manufactured from ECT-32 kraft corrugated..Corrugated boxes are recyclable..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..These Boxes are the industry standard!.Boxes ship and store flat to save space..Manufactured from ECT-48 kraft corrugated.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Wide openings along the length make these cartons easy to pack..For shipping long and narrow items such as wine bottles, umbrellas and carpet rolls..Long side opening..Long Boxes are manufactured from ECT-32, kraft corrugated..Sold and shipped flat in bundle quantities..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Hand holes allow for more convenient transportation..Heavy-duty, double wall construction provides greater protection and stacking strength..Constructed from ECT-48-DW, kraft corrugated.

30" x 24" x 24" Multi-Depth Adjustable 275#/ECT-44 Single Wall Corrugated, Pack of 10, Heavy-Duty construction and Multi-Depth style provides greater protection and stacking strength combined with flexibility..Quality standard strength industrial Corrugated Boxes..Manufactured from ECT-32 kraft corrugated..Corrugated boxes are recyclable..Corrugated Boxes make packing, shipping or moving jobs easy and convenient!

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage.Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage

Built for strength and reliability, these heavy-duty shipping boxes are designed to handle demanding packing and shipping tasks. Constructed from rugged 44 ECT corrugated material, they offer superior protection for heavier or bulkier items during transit or storage. Ideal for industrial, warehouse, or e-commerce use, these boxes help ensure your contents arrive safely and securely..These Boxes are the industry standard!.Boxes ship and store flat to save space..Constructed from rugged 44 ECT corrugated material.These cartons open along the ends for easy insertion of frames, mirrors and other flat products.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage.Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Built for strength and reliability, these heavy-duty shipping boxes are designed to handle demanding packing and shipping tasks. Constructed from rugged 44 ECT corrugated material, they offer superior protection for heavier or bulkier items during transit or storage. Ideal for industrial, warehouse, or e-commerce use, these boxes help ensure your contents arrive safely and securely..Fold to your desired size! No carton sizer required..Box sides are scored at multiple depths to allow easy height adjustments for a perfect fit..Save space and money by reducing the number of different cartons in your inventory..Use the right sized box to reduce your costs with parcel services..Made from strong, ECT-32, kraft corrugated.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage.Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Heavy-duty double-wall construction for maximum strength and durability.Designed to protect large or heavy items during shipping and storage.Resists crushing, punctures, and impact for added security.Ideal for industrial, warehouse, and commercial shipping needs.Easy to assemble and stack for efficient handling and storage

Built for strength and reliability, these heavy-duty shipping boxes are designed to handle demanding packing and shipping tasks. Constructed from rugged 44 ECT corrugated material, they offer superior protection for heavier or bulkier items during transit or storage. Ideal for industrial, warehouse, or e-commerce use, these boxes help ensure your contents arrive safely and securely..Heavy-duty construction provides greater protection and stacking strength..Manufactured from heavy-duty ECT-44 single wall kraft corrugated..These cartons are 40% stronger than standard shipping containers..Sold and shipped flat in bundle quantities..Heavy-duty construction provides greater protection and stacking strength.

Built for strength and reliability, these heavy-duty shipping boxes are designed to handle demanding packing and shipping tasks. Constructed from rugged 44 ECT corrugated material, they offer superior protection for heavier or bulkier items during transit or storage. Ideal for industrial, warehouse, or e-commerce use, these boxes help ensure your contents arrive safely and securely..Heavy-duty construction provides greater protection and stacking strength..Manufactured from heavy-duty ECT-44 single wall kraft corrugated..These cartons are 40% stronger than standard shipping containers..Sold and shipped flat in bundle quantities..Heavy-duty construction provides greater protection and stacking strength.

Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Protect and conceal your large shipments with Bulk Cargo Containers!.Use with Gaylord lids.Manufactured from D.W./ECT-48 kraft corrugated..Protects bulky, hard to pack irregularly shaped items.

18" x 18" x 15" Heavy Duty Shipping Boxes, 32 ECT, Brown, 20/Bundle (181815).Overall Dimensions: 18" x 18" x 15".32 ECT.These cartons are the industry standard

Built for strength and reliability, these heavy-duty shipping boxes are designed to handle demanding packing and shipping tasks. Constructed from rugged 44 ECT corrugated material, they offer superior protection for heavier or bulkier items during transit or storage..These Boxes are the industry standard!.Boxes ship and store flat to save space..Ideal for industrial, warehouse, or e-commerce use, these boxes help ensure your contents arrive safely and securely..These cartons open along the ends for easy insertion of frames, mirrors and other flat products.

Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Twice the protection of a standard carton.

Engineered for maximum durability, these heavy-duty shipping boxes are built to handle large, bulky, or heavy items with confidence. Made from tough 48 ECT double-wall corrugated material, they offer superior strength and protection during transit or storage. Ideal for industrial, warehouse, and commercial shipping environments, these boxes help ensure your goods arrive safely and securely..Quality standard strength industrial Corrugated Boxes..Manufactured from ECT-32 kraft corrugated..Corrugated boxes are recyclable..Twice the protection of a standard carton.

Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Added protection ensures that your shipments arrive safe..Manufactured from heavy-duty ECT-48 kraft corrugated..Heavy-duty construction provides greater protection and stacking strength..Cartons are sold in bundle quantities and ship flat to save on storage space and shipping..Heavy duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping.