Square Envelopes
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Envelope Size
Envelope Type
Envelope Closure
Envelope Number
Envelope Material
Item # : 282920
Model # : 5395-07-50
LUX® Size A9 envelope in gold metallic color measuring 5 3/4" x 8 3/4" has a basis weight of 80 lbs and is sold as 50 per pack.
- A9 Invitation Envelopes (5 3/4 x 8 3/4) are perfect for party invites/thank you cards/wedding invites/announcements
- Comes in Gold Metallic, 80lb. Text Paper
Price is $44.09
Unit of measure 50/Pack
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Item # : 24260828
Model # : 4872-M08-50
LUX A4 Invitation Envelopes (4 1/4 x 6 1/4) in Champagne Metallic are perfect for the Holidays, Invitations, Announcements, Sending Cards, and so much more!
- Dimensions: 4.25"L x 6.25"W
- Comes in Champagne Metallic
Price is $16.69
Unit of measure 50/Pack
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Item # : 24260728
Model # : 4865-NLI-50
LUX A1 Invitation Envelopes (3 5/8 x 5 1/8) in Natural Linen are perfect for the Holidays, Invitations, Announcements, Sending Cards, and so much more!
- Dimensions: 3.625"L x 5.125"W
- Comes in Natural Linen
Price is $14.79
Unit of measure 50/Pack
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Item # : 2633096
Model # : 4101C
JAM Paper open end envelopes are great for keeping and sending important papers and documents.
- Made from smooth 24lb paper, includes gummed flap closure
- Perfect for business mailing, storage, and organizing documents
Price is $33.09
Unit of measure 100/Pack
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This item will be discontinued soon. A suggested replacement is available.
See what our experts suggest
Item # : 508893
Model # : QUAR5106
Protect documents throughout the mailing process with these Quality Park Survivor Tyvek 14.25 x 20-inch catalog mailers.
- Catalog envelopes is used for sending flat, heavy materials or many small items like coins and catalogs
- White Tyvek envelopes provide superior protection for mailing important materials or documents
Price is $115.19
Unit of measure 25/Box
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Item # : 892994
Model # : QUAR4520
Protect important documents or accessories with this box of 100 Quality Park Survivor Tyvek white lightweight open-end expansion mailers
- Catalog envelopes are a convenient and reliable choice for personal and business mailing purposes
- White Tyvek envelopes provide superior protection for mailing important materials or documents
Price is $349.19
Unit of measure 100/Carton
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Item # : 1030021
Model # : 8504-GB-50
LUX 70lb. Grocery Bag 4 x 4 Square Envelopes are perfect for wedding invitations, RSVP cards, save the dates, or any other message.
- Square envelopes perfect for announcements/weddings/greeting cards/invitations
- Comes in Grocery Bag, 70lb. Text Paper
Price is $19.39
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Item # : 282284
Model # : 8545-03-50
Lux® Square envelope in natural color of size 7" x 7" provides a bit of sparkle to your event and comes with a contour flap, is sold as 50 per pack.
- Natural
- Size: 7" x 7"
Price is $40.09
Unit of measure 50/Pack
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Item # : 683576
Model # : QUA63663
Share documents with coworkers when you use these Quality Park 10 x 13-inch treated white-wove string-and-button closure interdepartmental envelopes.
- Treated Interdepartmental envelopes are easy to spot as being confidential
- Envelope size: 10"H x 13W"
Price is $131.39
Unit of measure 100/Box
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Item # : 24260318
Model # : 4870-NLI-50
LUX A2 (4 3/8 x 5 3/4) - Natural Linen in Natural Linen are perfect for invitations, greeting cards, thank you cards, and is ideal for letters as it's designed to fit quarter-folded sheets of paper.
- Dimensions: 4.375"L x 5.75"W
- Comes in Natural Linen
Price is $15.79
Unit of measure 50/Pack
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Item # : 24260653
Model # : 10910-50
LUX 6 x 6 Square Envelopes in 70lb. Bright White are perfect for the Holidays, Invitations, Announcements, Sending Cards, and so much more!
- Dimensions: 6"L x 6"W
- Comes in 70lb. Bright White
Price is $17.89
Unit of measure 50/Pack
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Item # : 263522
Model # : 920V0CL
JAM Paper® Plastic Envelopes have 12 document holders that are the perfect way to organize index cards and other small papers
- Color: Clear
- Size: 5.5 x 7.5 inches
Price is $40.19
Unit of measure 12/Pack Price per unit $3.35/Envelope
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Item # : 389378
Model # : QUA50662
Keep your small items neat and organized with this 500-count box of Quality Park light brown #6 gummed coin and small parts envelopes.
- US #6 simple high-quality coin and small parts envelopes that get the job done
- Envelope size: 6"H x 3 3/8"W
Price is $65.89
Unit of measure 500/Box
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Item # : 24260192
Model # : 7CO-GB-250
LUX #7 Coin Envelopes (3 1/2 x 6 1/2) in Grocery Bag are perfect for the HOLIDAYS, Weddings, Parties, Place Cards, small parts and more!
- Dimensions: 3.5"L x 6.5"W
- Comes in Grocery Bag
Price is $56.69
Unit of measure 250/Pack
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Item # : 282354
Model # : 5365-12-50
Lux® Size A1 envelope in bronze metallic color is best suited for RSVP as well as occasions calling for a dainty announcements and measures 3 5/8" x 5 1/8", is sold as 50 per pack.
- A1 Invitation Envelopes (3 5/8 x 5 1/8) are perfect for party invites/thank you cards/wedding invites/announcements
- Comes in Bronze Metallic, 80lb. Text Paper
Price is $13.79
Unit of measure 50/Pack
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Item # : 282504
Model # : 5370-06-50
LUX® Size A2 envelope in silver metallic color measuring 4 3/8" x 5 3/4" is best suited for letter writers while it is designed to hold a quarter folded sheet of paper and is sold as 50 per pack.
- Silver metallic
- Size: A2 (4 3/8" x 5 3/4")
Price is $14.39
Unit of measure 50/Pack
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Item # : 1589523
Model # : 80278I
The JAM Paper A7 violet recycled envelope features a closure that can be easily opened and closed for your convenience.
- Violet recycled envelope
- Blank interior for personalized message
Price is $19.99
Unit of measure 50/Pack
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Item # : 1277801
Model # : LUX-1590-101-1M
LUX Open End Window Envelopes - Includes a flap on the shorter side
- 9 x 12 Open End Window Envelopes are perfect for sending documents/catalogs/direct mail/promotional material/brochures
- Comes in Limelight, 80lb. Text Paper
Price is $405.89
Unit of measure 1000/Box
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Item # : 912032
Model # : QUA63576
Contain and send documents with this 100-pack of Quality Park string-and-button brightly colored yellow one-sided standard-style interdepartmental envelopes.
- Interdepartmental envelopes are easy to spot as being confidential
- Envelope size: 10"H x 13W"
Price is $129.09
Unit of measure 100/Carton
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Item # : 282099
Model # : 8504-AO-50
Lux® Square envelope in bright white color is perfect for handing out personal thank you notes, to use as gratuity envelope and more and measures 4" x 4", is sold as 50 per pack.
- 4 x 4 Square Envelopes are perfect for announcements/weddings/greeting cards/invitations
- Comes in 70lb. Bright White, 70lb. Text Paper
Price is $25.39
Unit of measure 50/Pack
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Item # : 24261154
Model # : 5350-06-50
LUX 9 x 12 Booklet Envelopes in Silver Metallic are perfect for Catalogs, Annual Reports, Brochures, Magazines, Invitations and more!
- Dimensions: 9"L x 12"W
- Comes in Silver Metallic
Price is $38.91
Unit of measure 50/Pack
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Item # : 1588929
Model # : 52610I
The JAM Paper A6 ultra lime brite hue envelope features a closure that can be easily opened and closed for your convenience.
- Ultra lime brite hue envelope
- Blank interior for personalized message
Price is $19.99
Unit of measure 50/Pack
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Item # : 263957
Model # : 34926
JAM Paper® A6 Size natural recycled parchment paper envelope is perfect for greeting cards, invitations, weddings or any announcements and comes in a vast range of sizes/colors.
- Natural
- Size: A6 (4 3/4" x 6 1/2")
Price is $10.59
Unit of measure 25/Pack
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Item # : 261316
Model # : 439911145B
JAM Paper® 4.5" x 4.5" White squared envelope with 100 pieces is perfect for greeting cards and weddings making your invitation a sparkle.
- Size: 4 1/2" x 4 1/2"
- Closure: Gum
Price is $35.59
Unit of measure 100/Box
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Item # : 23995922
Model # : 7489-W2-1000
LUX W-2 / 1099 Envelopes (5 3/4 x 8) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
- Comes in White
- Dimensions: 5.75"L x 8"W
Price is $261.29
Unit of measure 1000/Pack
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Item # : 282792
Model # : 4880-NLI-50
LUX® Size A7 envelope in natural linen color is perfect for social and announcements functions, it may also be utilized as an outer envelope for invitation purposes and has a size of 5 1/4" x 7 1/4", is sold as 50 per pack.
- A7 Invitation Envelopes (5 1/4 x 7 1/4) are perfect for party invites/thank you cards/wedding invites/announcements/5x7 photos
- Comes in Natural Linen, 80lb. Text Paper
Price is $27.19
Unit of measure 50/Pack
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Item # : 2622379
Model # : QUAR4450
Quality Park Tyvek® Expansion white envelopes featuring expanding gusset and self adhesive closure measures 10" x 15" x 2" and has a redi strip closure that doesn't require moisture to seal which is sold as 100 per pack.
- Size: 10" x 15" x 2"
- Self-sealing open side flap stik closure
Price is $317.29
Unit of measure 100/Carton
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Item # : 385007
Model # : 5360-17-250
LUX® Size 10 square flap envelope in amethyst metallic color of size 4 1/8" x 9 1/2" forms a perfect choice for personal or corporate business use and is sold as 250 per box.
- #10 Square Flap Envelopes are perfect for mailing checks/invoices/letterhead/personal letters/statements/direct mail
- Comes in Amethyst Metallic, 80lb. Text Paper
Price is $107.29
Unit of measure 250/Box
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Item # : 282379
Model # : 910003121/06827
Lux® Size A1 envelope in lilac color is best suited for RSVP and also for announcements and measures 3 5/8" x 5 1/8", is sold as 50 per pack.
- Lilac
- Size: A1 (3 5/8" x 5 1/8")
Price is $21.49
Unit of measure 50/Pack
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Item # : 24260540
Model # : LUX-4860-L20-50
LUX #10 Square Flap Envelopes (4 1/8 x 9 1/2) in Citrus are perfect for mailing Checks, Invoices, Letterhead, Personal Letters, Statements, Direct Mail and more!
- Dimensions: 4.125"L x 9.5"W
- Comes in Citrus
Price is $29.09
Unit of measure 50/Pack
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Item # : 516427
Model # : 7716-GB-250
LUX® Open end envelope in grocery bag color measuring #10 (4 1/8" x 9 1/2") is ideal for sending flat, bulky materials or many small items like coins, catalogs and jumbo cards, sold as 250 per box.
- #10 Open End Envelopes are perfect for mailing checks/invoices/letterhead/personal letters/statements/direct mail
- Comes in Grocery Bag, 70lb. Text Paper
Price is $135.39
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Item # : 263922
Model # : 4231
JAM Paper® Regular square envelope of dimension 8.5" x 8.5" in white color with gummed closure is perfect for greeting cards, invitations, weddings or any announcement.
- Size: 8 1/2" x 8 1/2"
- Closure: Gum
Price is $25.19
Unit of measure 25/Pack
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Item # : 1588839
Model # : 3243678I
The JAM Paper A6 gold foil lined black recycled envelope bears a touch of creativity while carrying your invitations or messages with utmost safety.
- Black with gold foil lined recycled envelope
- Blank interior for personalized message
Price is $37.09
Unit of measure 50/Pack
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Item # : 1277789
Model # : 61112-70W-500
LUX White Open End Envelopes - Envelopes with a small window to position the address through it
- 9 x 12 Open End Window Envelopes are perfect for sending documents/catalogs/direct mail/promotional material/brochures
- Comes in White, 70lb. Text Paper
Price is $294.39
Unit of measure 500/Box
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Trending now
13% off of Staples QuickStrip EasyClose Self Seal Security Tinted #10 Business Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST50312-CC)
Price is $24.99, Regular price was $28.79, You save 13%
Unit of measure 500/Box Price per unit $0.05/Envelope
Next-Day Delivery by tomorrow
1-hr pickup
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15% off of Glad 13 Gallon Trash Bag, 8.5"x8.5", Low Density, .72 mil, White, 100 Bags/Box (CLO 78526)
Price is $16.39, Regular price was $19.39, You save 15%
Unit of measure 100/Box Price per unit $0.16/bag
Next-Day Delivery by tomorrow
1-hr pickup
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13% off of Staples Notepads, 8.5" x 11.75", Wide Ruled, White, 50 Sheets/Pad, Dozen (ST57339M/57339)
Price is $16.99, Regular price was $19.59, You save 13%
Unit of measure Dozen Price per unit $1.42/Pad
Next-Day Delivery by tomorrow
1-hr pickup
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13% off of Staples QuickStrip EasyClose Self Seal Security Tinted #10 Business Envelopes, 4 1/8" x 9 1/2", White, 100/Box (ST50308-CC)
Price is $7.99, Regular price was $9.29, You save 13%
Unit of measure 100/Box Price per unit $0.08/Envelope
Next-Day Delivery by tomorrow
1-hr pickup
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11% off of Staples 30% Recycled File Folders, 1/3-Cut Tab, Letter Size, Manila, 250/Box (ST56673-CC)
Price is $27.99, Regular price was $31.69, You save 11%
Unit of measure 250/Box Price per unit $0.11/File Folder
Next-Day Delivery by tomorrow
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There is something about a square flap on an envelope that denotes importance. It is no wonder then that many significant invitations and announcements are packaged in just such a wrapper. But don't make the mistake of thinking these classic mailers are just for personal use. Businesses can make a similar statement by choosing a square-flapped envelope, with or without a clear window. Peruse the dozens of options available from leading office supply brands like JAM Paper, LUX, and Staples.
Narrow Your Choices
Selecting a business envelope can be more daunting than you think. While it is nice to have choices, narrowing them down can be difficult. Square-flapped envelopes are available in dimensions ranging from 3 1/2" x 6" (the smallest commercial size available) to jumbo 13" x 19" mailers and everything in between, including the standard #10 envelope. As for color? Depending on your needs, 17 different color choices beckon, some with address windows, some without.
Not Quite Done Yet
You've determined your specific needs when it comes to color and size in a square-flapped envelope, but you're not quite done yet. Depending on what you are mailing, you may or may not need clear address windows. If you do need a window, how many and where should they be? Single left, single right, and double left windows are the most popular choices but not the only ones. A full-faced over-sized clear center window is also an option for special mailing projects.
Almost There
It should be apparent by now that the "one size fits all" days of business envelopes are long gone. As are the days when licking or using a sponge to seal them was the only choice. Yes, the old-school sealants are still available, but many other options are, too. Choose redi-seal strips that require no moisture or convenient peel-and-stick closures. Now that you have chosen your square envelope, purchase in packs of as few as 20 or as many as 1,000.
Narrow Your Choices
Selecting a business envelope can be more daunting than you think. While it is nice to have choices, narrowing them down can be difficult. Square-flapped envelopes are available in dimensions ranging from 3 1/2" x 6" (the smallest commercial size available) to jumbo 13" x 19" mailers and everything in between, including the standard #10 envelope. As for color? Depending on your needs, 17 different color choices beckon, some with address windows, some without.
Not Quite Done Yet
You've determined your specific needs when it comes to color and size in a square-flapped envelope, but you're not quite done yet. Depending on what you are mailing, you may or may not need clear address windows. If you do need a window, how many and where should they be? Single left, single right, and double left windows are the most popular choices but not the only ones. A full-faced over-sized clear center window is also an option for special mailing projects.
Almost There
It should be apparent by now that the "one size fits all" days of business envelopes are long gone. As are the days when licking or using a sponge to seal them was the only choice. Yes, the old-school sealants are still available, but many other options are, too. Choose redi-seal strips that require no moisture or convenient peel-and-stick closures. Now that you have chosen your square envelope, purchase in packs of as few as 20 or as many as 1,000.