Sponsored Products
Staples Self Seal Self Seal Security Tinted #8 Double Window Envelopes, 3 5/8" x 8 5/8", White, 500/Box (ST28732-CC)~#|#~C1DE4A05-5BF1-4CB6-AF706FC6A1C4D67B_sc7
Staples Self Seal Self Seal Security Tinted #8 Double Window Envelopes, 3 5/8" x 8 5/8", White, 500/Box (ST28732-CC)~#|#~F184BBF9-34E0-4442-81F1861DBB29DFFD_sc7
14% off of Staples Self Seal Self Seal Security Tinted #8 Double Window Envelopes, 3 5/8" x 8 5/8", White, 500/Box (ST28732-CC)
Item # : 1775860
Model # : ST28732-CC
Make mailing projects manageable with this 500-pack of white self-sealing security-tinted double-window #8-5/8 envelopes.
  • Pressure Sensitive Adhesive
  • #8-5/8 business envelopes are suitable for all your mailing needs
Price is $29.99, Regular price was $34.99, You save 14%
Unit of measure 500/Box Price per unit $0.06/Envelope
Delivery by Wed, May 14
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Staples Self Seal Self Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST28731-CC)~#|#~C1DE4A05-5BF1-4CB6-AF706FC6A1C4D67B_sc7
Staples Self Seal Self Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST28731-CC)~#|#~F5441B5F-2F28-4D45-BEE05F26392EE091_sc7
14% off of Staples Self Seal Self Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST28731-CC)
Item # : 1775861
Model # : ST28731-CC
Send mail easily with this 500-pack of Staples security-tinted double-window self-sealing #9 envelopes.
  • Pressure Sensitive Adhesive
  • #9 business envelopes are suitable for all your mailing needs
Price is $29.99, Regular price was $34.99, You save 14%
Unit of measure 500/Box Price per unit $0.06/Envelope
Delivery by Wed, May 14
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Staples Self Seal Self Seal Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST28730-CC)~#|#~C1DE4A05-5BF1-4CB6-AF706FC6A1C4D67B_sc7
Staples Self Seal Self Seal Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST28730-CC)~#|#~22F7C042-EEBE-4C34-8AC6CCDCE93451D7_sc7
Item # : 1775862
Model # : ST28730-CC
Mail all your business correspondence with this 500-count box of self-sealing Staples security-tinted double-window envelopes.
  • Pressure Sensitive Adhesive
  • #10 business envelopes are suitable for all your mailing needs
Price is $34.99
Unit of measure 500/Box Price per unit $0.07/Envelope
Delivery by Wed, May 14
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Staples Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST20137)~#|#~AE1BB140-9743-4C67-BBE1972255DDD93E_sc7
Staples Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST20137)~#|#~91389021-99C1-4B5E-AB395FCAE6404667_sc7
Item # : 892095
Model # : ST20137
#10 double-window security-tint gummed envelopes feature generously sized recipient and sender windows, making addresses easy to scan and read.
  • PACKAGING MAY VARY, SAME GREAT PRODUCT.
  • US #10 business envelopes are suitable for many mailing projects
Price is $32.49
Unit of measure 500/Box Price per unit $0.06/Envelope
Delivery by Wed, May 14
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Staples Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST266759-CC)~#|#~CA8F9A39-0429-4A16-A4C553898A110D20_sc7
Staples Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST266759-CC)~#|#~FD84E347-9FA6-446D-AEC7787B89913917_sc7
15% off of Staples Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST266759-CC)
Item # : 266759
Model # : ST266759-CC
Protect your mail with this 500-pack of Staples standard invoice double-window security-tint gummed #9 envelopes.
  • PACKAGING MAY VARY, SAME GREAT PRODUCT.
  • US #9 business envelopes are suitable for many mailing projects
Price is $24.99, Regular price was $29.59, You save 15%
Unit of measure 500/Box Price per unit $0.05/Envelope
Delivery by Wed, May 14
1-hr pickup
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Staples Laser Security Tinted Double Window Envelopes, 3 5/8" x 8 7/8", Wove White, 500/Box (ST394062-CC)~#|#~C39630DD-6A75-47E8-8D8FD913E48BEAD0_sc7
Staples Laser Security Tinted Double Window Envelopes, 3 5/8" x 8 7/8", Wove White, 500/Box (ST394062-CC)~#|#~79F8C193-D873-4D92-AF21E923C116C374_sc7
18% off of Staples Laser Security Tinted Double Window Envelopes, 3 5/8" x 8 7/8", Wove White, 500/Box (ST394062-CC)
Item # : 394062
Model # : ST394062-CC
Keep confidential information away from prying eyes with this 500-pack of Staples laser double-window security-tint gummed envelopes.
  • Business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $22.99, Regular price was $28.19, You save 18%
Unit of measure 500/Box Price per unit $0.05/Envelope
Delivery by Wed, May 14
1-hr pickup
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Staples Security Tinted #8 Business Envelopes, 3 5/8" x 8 5/8", White, 500/Box (438614-CC)~#|#~AEC56B14-2598-4B8B-ADAA456A0EE9352F_sc7
Staples Security Tinted #8 Business Envelopes, 3 5/8" x 8 5/8", White, 500/Box (438614-CC)~#|#~E68C16D4-7DAC-4260-930EB1EDBD648CBB_sc7
Item # : 438614
Model # : ST438614-CC
Staples #8 5/8-inch check-size double-window security-tint gummed envelopes feature windows for both the recipient and sender, eliminating the need to manually address your mailings.
  • #8-5/8 business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $35.79
Unit of measure 500/Box Price per unit $0.07/Envelope
Free delivery by Wed, May 14
1-hr pickup
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Quality Park Reveal-N-Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White Wove, 500/Box (QUA67529)~#|#~sp40319149_sc7
Quality Park Reveal-N-Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White Wove, 500/Box (QUA67529)~#|#~sp40319148_sc7
Item # : 717358
Model # : QUA67529
Prepare invoices, statements, and other documents for mailing with these Quality Park Reveal-N-Seal #9 double-window envelopes.
  • US #9 business envelopes are suitable for many mailing projects
  • Made from white wove 24 lb. paper for durability
Price is $105.09
Unit of measure 500/Box
Free delivery by Wed, May 14
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Quality Park Redi-Seal Self Seal Security Tinted #10 Double Window Envelope, 4 1/2" x 9 1/2", White Wove, 50/Pack (24559-QP-50)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal Security Tinted #10 Double Window Envelope, 4 1/2" x 9 1/2", White Wove, 50/Pack (24559-QP-50)~#|#~sp5875503_sc7
Item # : 23996473
Model # : 24559-QP-50
Quality Park #10 Double Window Envelope (4 1/8 x 9 1/2) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • #10 Double window business envelope
  • Dimensions: 4.125"L x 9.5"W
Price is $41.59
Unit of measure 50/Pack
Free delivery by Wed, May 21
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Staples Laser Forms Double Window Envelopes, Wove White, 500/Box (ST473949-CC)~#|#~98F8178F-0805-4EA4-BD6B3386BC119E79_sc7
Staples Laser Forms Double Window Envelopes, Wove White, 500/Box (ST473949-CC)~#|#~7CC0D6A4-3F5C-487D-8365CB48550DEE0C_sc7
Item # : 473949
Model # : ST473949-CC
Mail sensitive documents with confidence in these Staples double-window gummed envelopes.
  • Business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $35.59
Unit of measure 500/Box Price per unit $0.07/Envelope
Free delivery by Wed, May 14
1-hr pickup
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Staples Laser Check Size Gummed Security Tinted Business Envelopes, 3 5/8" x 8 7/8", Wove White, 1000/Box (381898/17046)~#|#~49080BE6-F12A-4D65-844CBF009A20E63A_sc7
Staples Laser Check Size Gummed Security Tinted Business Envelopes, 3 5/8" x 8 7/8", Wove White, 1000/Box (381898/17046)~#|#~7AC16250-0823-4F14-96BE887F40194217_sc7
Item # : 381898
Model # : ST381898-CC
Save the hassle of applying address labels with this 1,000-pack of Staples check-size double-window security-tint laser gummed envelopes.
  • Business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $56.29
Unit of measure 1000/Box Price per unit $0.06/Envelope
Free delivery by Wed, May 14
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Staples Gummed Business Envelopes, 4 3/16" x 9", White, 1000/Box (381911/17045)~#|#~A8D8B9B1-CADD-4023-A4E6812D7A1F6233_sc7
Staples Gummed Business Envelopes, 4 3/16" x 9", White, 1000/Box (381911/17045)~#|#~BECCA8B3-A385-4BBE-83E1777454C6A573_sc7
Item # : 381911
Model # : ST381911-CC
Send out laser-printed invoices and other documents with this 1,000-pack of Staples 4-3/16 x 9-inch white gummed double-window envelopes for laser forms.
  • Business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $75.29
Unit of measure 1000/Box Price per unit $0.08/Envelope
Free delivery by Wed, May 14
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Quality Park Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White, 500/Box (QUA24532)~#|#~sp41689013_sc7
Quality Park Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White, 500/Box (QUA24532)~#|#~sp41689012_sc7
Item # : 864978
Model # : QUA24532
Send invoices, bills and correspondence with these Quality Park white #8 double-window gummed security tint envelopes.
  • US #8 business envelopes are suitable for many mailing projects
  • Made from white 24 lb. wove paper for durability
Price is $79.89
Unit of measure 500/Box
Free delivery by Fri, May 16
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Medical Arts Press Self Seal Security Tinted #4 Double Window Envelope, White, 500/Box (32373)~#|#~CBC42786-3FEB-46D6-9D140647FA028B74_sc7
Medical Arts Press Self Seal Security Tinted #4 Double Window Envelope, White, 500/Box (32373) is Clearance
10% off of Medical Arts Press Self Seal Security Tinted #4 Double Window Envelope, White, 500/Box (32373)
Item # : 541947
Model # : 32373
No reviews yet
  • Self-seal envelope with with clear filmview windows
  • Patient's name and address show through bottom window, your return address shows through top
Price is $26.47, Regular price was $29.42, You save 10%
Unit of measure 500/Box
Delivery by Wed, May 14
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This item will be discontinued soon. A suggested replacement is available.
Quality Park Redi-Seal Self Seal #10 Double Window Envelope, 4 1/2" x 9 1/2", White Wove, 250/Pack (24559-QP-250)~#|#~s1196808_sc7
Item # : 23995341
Model # : 24559-QP-250
Quality Park #10 Double Window Envelope (4 1/8" x 9 1/2") are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in White Wove w/ Self-Seal
  • Dimensions: 4 1/8"L x 9 1/2"W
Price is $87.99
Unit of measure 250/Pack
Free delivery by Wed, May 21
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Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope, 3 5/8" x 8 5/8", White, 250/Pack (24539-250)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope, 3 5/8" x 8 5/8", White, 250/Pack (24539-250)~#|#~sp5875517_sc7
Item # : 23995962
Model # : 24539-250
Quality Park #8 5/8 Double Window Envelope (3 5/8 x 8 5/8) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in White Wove w/ Self-Seal
  • Dimensions: 3.625"L x 8.625"W
Price is $90.59
Unit of measure 250/Pack
Free delivery by Wed, May 21
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Quality Park Gummed Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (24550)~#|#~sp42187244_sc7
Item # : 2495723
Model # : QUA24550
Preserve confidentiality while mailing paperwork with these Quality Park #10 double-window security-tinted white gummed envelopes.
  • US #10 business envelopes are suitable for many mailing projects
  • Made from white 24 lb. paper for durability
Price is $96.79
Unit of measure 500/Box
Free delivery by Wed, May 14
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ComplyRight Double Window Envelope, 5.63" x 9", White/Black, 100/Pack (91911)~#|#~B2179B04-F9F4-4AA2-9ADD4AA65ECF5354_sc7
ComplyRight Double Window Envelope, 5.63" x 9", White/Black, 100/Pack (91911)~#|#~5D1E87C4-2922-489B-A9043C01D5DADEB7_sc7
Item # : 24578184
Model # : 91911
No reviews yet
  • Simple high-quality double-window envelope that gets the job done
  • Dimensions: 5.63" x 9"
Price is $48.09
Free delivery by Thu, May 22
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Quality Park Gummed Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White Wove, 500/Box (QUA24524)~#|#~sp40322449_sc7
Quality Park Gummed Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White Wove, 500/Box (QUA24524)~#|#~sp40322448_sc7
Item # : 823255
Model # : QUA24524
Mail private information with confidence by using this box of 500 Quality Park gummed security-tinted double-window white #9 envelopes.
  • US #9 business envelopes are suitable for many mailing projects
  • Made from white wove 24 lb. paper for durability
Price is $96.79
Unit of measure 500/Box
Free delivery by Wed, May 14
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ComplyRight Double Window Envelope for W-2 (5218) Tax Form, 5.63" x 9", White/Black, 100/Pack (51511)~#|#~6C9F0C92-003F-42C4-9C4F4E93840D4708_sc7
ComplyRight Double Window Envelope for W-2 (5218) Tax Form, 5.63" x 9", White/Black, 100/Pack (51511)~#|#~81E8A2DB-D3F6-4B3B-B58C5327BF815A20_sc7
Item # : 24578186
Model # : 51511
No reviews yet
  • Simple high-quality double-window envelope for W-2 (5218) tax form that gets the job done
  • Dimensions: 5.63" x 9"
Price is $48.09
Free delivery by Thu, May 22
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Quality Park Redi-Seal Self Seal #10 Double Window Envelope, 4 1/2" x 9 1/2", White Wove, 500/Pack (24559-QP-500)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal #10 Double Window Envelope, 4 1/2" x 9 1/2", White Wove, 500/Pack (24559-QP-500)~#|#~sp79645420_sc7
Item # : 23995432
Model # : 24559-QP-500
Quality Park #10 Double Window Envelope (4 1/8 x 9 1/2) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in White Wove w/ Self-Seal
  • Dimensions: 4.125"L x 9.5"W
Price is $131.99
Unit of measure 500/Pack
Free delivery by Wed, May 21
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Quality Park Redi-Seal Self Seal Security Tinted #9 Double Window Envelope, 3 7/8" x 8 7/8", White Wove, 250/Pack (24529-250)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal Security Tinted #9 Double Window Envelope, 3 7/8" x 8 7/8", White Wove, 250/Pack (24529-250)~#|#~s1196808_sc7
Item # : 23996116
Model # : 24529-250
Quality Park #9 Double Window Envelopes - Redi-Seal (8 13/16 x 3 7/8) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in 24lb. White w/ Security Tint
  • Dimensions: 3.875"L x 8.875"W
Price is $89.09
Unit of measure 250/Pack
Free delivery by Wed, May 21
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This item will be discontinued soon. A suggested replacement is available.
Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White Wove, 50/Pack (24539-50)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White Wove, 50/Pack (24539-50)~#|#~sp5875517_sc7
Item # : 23995955
Model # : 24539-50
Quality Park #8 5/8 Double Window Envelope (3 5/8 x 8 5/8) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in White Wove w/ Self-Seal
  • Dimensions: 3.625"L x 8.625"W
Price is $58.19
Unit of measure 50/Pack
Free delivery by Wed, May 21
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ComplyRight Moistenable Glue Double-Window Envelope, 5.63" x 9", White/Black, 100/Pack (DW4SD)~#|#~2D9EA7A3-E201-4736-ABE6A6F77F873227_sc7
Item # : 24578185
Model # : DW4SD
No reviews yet
  • High-quality double-window 4-up box envelope that gets the job done
  • Dimensions: 5.63" x 9"
Price is $48.09
Free delivery by Thu, May 22
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ComplyRight Moistenable Glue Double-Window Envelope, 5.63" x 9", White/Black, 100/Pack (DW387D)~#|#~3A6776ED-FD14-40BC-9A7E1975417FEDAA_sc7
Item # : 24578232
Model # : DW387D
No reviews yet
  • High-quality double-window 4-up horizontal envelope that gets the job done
  • Dimensions: 5.63" x 9"
Price is $48.09
Free delivery by Thu, May 22
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LUX Self Seal Security Tinted A2 Window Envelope, 4 3/8" x 5 3/4", White, 500/Pack (7486-W2-500)~#|#~sp14807383_sc7
Item # : 24260594
Model # : 7486-W2-500
LUX W-2 / 1099 Envelopes (5 3/4 x 8 7/8) in 24lb. White w/ Security Tint are perfect for mailing Checks, Invoices, Letterhead, Personal Letters, Statements, Direct Mail and more!
  • Dimensions: 5.75"L x 8.875"W
  • Comes in 24lb. White w/ Security Tint
Price is $102.09
Unit of measure 500/Pack
Free delivery by Wed, May 21
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LUX W-2 / 1099 Envelopes (5 3/4 x 8) 500/Pack, White (7489-W2-500)~#|#~sp5822112_sc7
LUX W-2 / 1099 Envelopes (5 3/4 x 8) 500/Pack, White (7489-W2-500)~#|#~sp5875302_sc7
Item # : 23995918
Model # : 7489-W2-500
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 $148.09
Unit of measure 500/Pack
Free delivery by Wed, May 21
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Lux Double Window Invoice Envelopes Citrus 4 1/8 x 9 1/2 inch 50/Pack~#|#~m002084678_sc7
Item # : 1559063
Model # : INVDW-L20-50
No reviews yet
Lux Citrus Double Window Envelopes - Measure 4.12 x 9.12 inch in size and are great for sending invitations
  • Color: Citrus
  • Type: Window Envelopes
Price is $48.59
Free delivery by Wed, May 21
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Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope, 3 5/8" x 8 5/8", White Wove, 1000/Pack (24539-1000)~#|#~sp5822112_sc7
Quality Park Redi-Seal Self Seal Security Tinted #8 Double Window Envelope, 3 5/8" x 8 5/8", White Wove, 1000/Pack (24539-1000)~#|#~sp5875517_sc7
Item # : 23996467
Model # : 24539-1000
Quality Park #8 5/8 Double Window Envelope (3 5/8 x 8 5/8) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail
  • Comes in White Wove w/ Self-Seal
  • Dimensions: 3.625"L x 8.625"W
Price is $224.29
Unit of measure 1000/Pack
Free delivery by Wed, May 21
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LUX Security Tinted A2 Window Envelope, 4 3/8" x 5 3/4", White, 1000/Pack (7486-W2-1000)~#|#~sp14807383_sc7
Item # : 24260623
Model # : 7486-W2-1000
LUX W-2 / 1099 Envelopes (5 3/4 x 8 7/8) in 24lb. White w/ Security Tint are perfect for mailing Checks, Invoices, Letterhead, Personal Letters, Statements, Direct Mail and more!
  • Dimensions: 5 3/4"L x 8 7/8"W
  • Comes in 24lb. White w/ Security Tint
Price is $192.59
Unit of measure 1000/Pack
Free delivery by Wed, May 21
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LUX W-2 / 1099 Envelopes (5 3/4 x 8) 1000/Pack, White (7489-W2-1000)~#|#~sp5822112_sc7
LUX W-2 / 1099 Envelopes (5 3/4 x 8) 1000/Pack, White (7489-W2-1000)~#|#~sp5875302_sc7
Item # : 23995922
Model # : 7489-W2-1000
No reviews yet
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
Free delivery by Wed, May 21
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LUX Double Window Invoice Envelopes (4 1/8 x 9 1/8) 50/Box, Pool (INVDW-102-50)~#|#~m004063893_sc7
Item # : 2147471
Model # : INVDW-102-50
No reviews yet
LUX Double Window Invoice Envelopes (4 1/8 x 9 1/8) are perfect for sending letters, invoices or statements.
  • Double Window Invoice Envelopes (4 1/8 x 9 1/8) are the perfect envelope for all Quickbooks invoicing/accounting mailings
  • Comes in Pool, 80lb. Text Paper
Price is $26.79
Unit of measure 50/Pack
Delivery by Wed, May 21
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LUX Double Window Invoice Envelopes (4 1/8 x 9 1/8) 500/Box, Pool (INVDW-102-500)~#|#~m004063893_sc7
Item # : 2147437
Model # : INVDW-102-500
No reviews yet
LUX Double Window Invoice Envelopes (4 1/8 x 9 1/8) are perfect for sending letters, invoices or statements.
  • Peel & Press Sealing Method
  • Invoice Double Window Envelopes w/ Peel & Press (4 1/8 x 9 1/8) - Pool Blue 500/PK
Price is $98.79
Unit of measure 500/Pack
Free delivery by Wed, May 21
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Window design

Double window envelopes are a great way to streamline your business's mail out process. These high quality envelopes features two transparent windows, allowing you to easily display addresses without needing to affix separate address labels. Ideal for use with accounting statements and invoices, double window envelopes make it easier than ever to send out mail in bulk. Double window envelopes have two rectangular cut-outs on the front of the envelope that reveal both recipient's name and address as well as the sender's contact information. This makes it easy to identify who the letter is intended for, saving time and effort when sending out multiple pieces of mail. The windows also help reduce paper waste by eliminating the need for separate address labels.

Secure closure

Each envelope comes with a secure gummed flap that will keep contents safe and secure during transit. Double window envelopes come in several sizes so you can find just the right envelope for your needs. Double window envelopes are made from durable material that won't rip or tear even during long distance shipping. The paper is thick enough to prevent confidential documents from being viewed through the windows and offers excellent protection against moisture damage as well as dust and dirt buildup. Staples has a wide selection of double window envelopes available in different sizes and materials, so you can find exactly what you need for your business mailing needs. Choose plain white envelopes or opt for colored options like blue, green, yellow - either way, you're sure to get high quality results every time!