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Staples 6.5 x 9.5 Kraft Clasp Envelopes, Brown, Gummed Flap & Metal Clasp Closure, Ideal for Filing, Storing & Mailing, 100/Pack~#|#~BAB0DBC0-0BEA-432E-BC50052CFF7F71DE_sc7Staples 6.5 x 9.5 Kraft Clasp Envelopes, Brown, Gummed Flap & Metal Clasp Closure, Ideal for Filing, Storing & Mailing, 100/Pack~#|#~FECE3FA4-A6EC-4952-9D6160A66423B732_sc7
Item: 534990
Model: ST534990-CC
Price is $31.09
Unit of measure 100/Box Price per unit $0.31/Envelope
Next-Day Delivery by tomorrow
30-min pickup
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Staples 12 x 15.5 Clasp & Moistenable Glue Kraft Catalog Envelopes, Brown, Heavy‑Duty Mailing Envelopes for Documents, 100/Box~#|#~B1A7E20E-7195-4296-BBDAB29BDF33CF88_sc7Staples 12 x 15.5 Clasp & Moistenable Glue Kraft Catalog Envelopes, Brown, Heavy‑Duty Mailing Envelopes for Documents, 100/Box~#|#~DB5E5BDD-D14D-45AA-924C1B2B4A473ACB_sc7
Item: 472902
Model: ST472902-CC
Price is $37.79
Unit of measure 100/Box Price per unit $0.38/Envelope
Free Next-Day eligible by tomorrow
30-min pickup
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Staples Poly Envelopes, Side‑Opening Document Sleeves with String & Button Closure, Durable Poly Construction, 5/Pack~#|#~676D38D2-4E46-4901-953D90C0F89E4B4F_sc7Staples Poly Envelopes, Side‑Opening Document Sleeves with String & Button Closure, Durable Poly Construction, 5/Pack~#|#~2A31369B-A17A-47E8-8E8159B7E5856F08_sc7
Item: 599609
Model: TR34530-CC
Price is $13.59
Unit of measure 5/Pack Price per unit $2.72/Envelope
Next-Day Delivery by tomorrow
30-min pickup
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Staples #6 3/4 EasyClose White Envelopes, Self‑Seal Convenience Mailers, 100/Box~#|#~s1223331_sc7Staples #6 3/4 EasyClose White Envelopes, Self‑Seal Convenience Mailers, 100/Box~#|#~s1223330_sc7
Item: 487506
Model: ST14011-CC
Price is $14.99
Unit of measure 100/Box
Next-Day Delivery by tomorrow
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Staples #10 Self‑Sealing Envelopes, White, Quick Close Adhesive, Professional Mailing Envelopes, 500/Box~#|#~1D22CEC3-EF53-4FB5-A5BA1C460E01583A_sc7Staples #10 Self‑Sealing Envelopes, White, Quick Close Adhesive, Professional Mailing Envelopes, 500/Box~#|#~1DDEEC0B-AA88-4AF4-80F52C96DE579C95_sc7
Item: 570240
Model: ST570240-CC
Price is $32.29
Unit of measure 500/Box Price per unit $0.06/Envelope
Next-Day Delivery by tomorrow
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Staples 10 x 13 Self‑Sealing Catalog Envelopes, White Wove, Peel & Seal Strong Closure, Heavyweight Mailing Envelopes, 100/Box~#|#~s1224632_sc7
Item: 478157
Model: ST19807-CC
Price is $43.19
Unit of measure 100/Box
Free Next-Day eligible by tomorrow
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Staples Double‑Window Business Envelopes, White, Gummed Closure, 9" x 4.2", 1000/Pack~#|#~A8D8B9B1-CADD-4023-A4E6812D7A1F6233_sc7Staples Double‑Window Business Envelopes, White, Gummed Closure, 9" x 4.2", 1000/Pack~#|#~BECCA8B3-A385-4BBE-83E1777454C6A573_sc7
Item: 381911
Model: ST381911-CC
Price is $73.59
Unit of measure 1000/Box Price per unit $0.07/Envelope
Free Next-Day eligible by tomorrow
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Staples 9 x 12 Gummed Catalog Envelopes, White Wove, Durable Mailing Envelopes for Documents & Letters, 100/Box~#|#~C5E12C4F-C941-437B-A9E0035CB1DA97F9_sc7Staples 9 x 12 Gummed Catalog Envelopes, White Wove, Durable Mailing Envelopes for Documents & Letters, 100/Box~#|#~864F4B23-2902-48C7-879B2ADB6A4399B8_sc7
Item: 472886
Model: ST472886N-CC
Price is $36.99
Unit of measure 100/Box Price per unit $0.37/Envelope
Free Next-Day eligible by tomorrow
30-min pickup
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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_sc7Quality 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
Price is $92.89
Unit of measure 250/Pack
Free delivery by Mon, Jul 27
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Staples #10 QuickStrip EasyClose Business Envelopes, White, Peel & Seal, Security‑Tinted, 9.5" x 4.125", 100/Pack~#|#~9D61BF36-F926-4189-B751F8BE3F66B083_sc7Staples #10 QuickStrip EasyClose Business Envelopes, White, Peel & Seal, Security‑Tinted, 9.5" x 4.125", 100/Pack~#|#~B2C81072-7CD5-46C7-9F58781765042EC9_sc7
Item: 329841
Model: ST21573-CC
Price is $27.79
Unit of measure 100/Box Price per unit $0.28/Envelope
Next-Day Delivery by tomorrow
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Staples Booklet Envelopes, 9" × 12", Side‑Opening, White Wove Paper, Durable Construction, 100/Box~#|#~C25F6457-B752-4CCE-92C76AEF9248412F_sc7Staples Booklet Envelopes, 9" × 12", Side‑Opening, White Wove Paper, Durable Construction, 100/Box~#|#~7176E32C-DD4A-49B3-904D04684937ED94_sc7
Item: 473009
Model: ST473009-CC
Price is $33.89
Unit of measure 100/Box Price per unit $0.34/Envelope
Next-Day Delivery by tomorrow
30-min pickup
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Staples QuickStrip EasyClose #10 Business Envelopes, 4 1/8" x 9 1/2", White, 100/Box (394047N)~#|#~874C076E-30E1-4019-BCAD79AF3EE8E1F6_sc7Staples QuickStrip EasyClose #10 Business Envelopes, 4 1/8" x 9 1/2", White, 100/Box (394047N)~#|#~1ED15A4C-99F0-44F1-B454A42378FDEB93_sc7
Item: 394047
Model: ST394047N-CC
Price is $11.79
Unit of measure 100/Box
Delivery by Tue, Jul 28
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Staples 6 x 9 Economy Catalog Envelopes, White Wove, Gummed Flap Seal, Lightweight Document Mailers, 250/Box~#|#~6DD124EA-BF63-439C-8FF4231A21C323E5_sc7Staples 6 x 9 Economy Catalog Envelopes, White Wove, Gummed Flap Seal, Lightweight Document Mailers, 250/Box~#|#~6A28413A-6788-4D2E-A8D2E4F3120AA800_sc7
Item: 247668
Model: ST50303-CC
Price is $33.09
Unit of measure 250/Box Price per unit $0.13/Envelope
Next-Day Delivery by tomorrow
30-min pickup
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Staples Tyvek 10 x 13 EasyClose Catalog Envelopes, White with Green Diamond Border, Tear‑Resistant & Waterproof Mailers, 100/Box~#|#~sp37727759_sc7Staples Tyvek 10 x 13 EasyClose Catalog Envelopes, White with Green Diamond Border, Tear‑Resistant & Waterproof Mailers, 100/Box~#|#~sp37727758_sc7
Item: 534966
Model: ST19855-CC
Price is $79.39
Unit of measure 100/Box Price per unit $0.79/Envelope
Free Next-Day eligible by tomorrow
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Staples 14 x 18 Jumbo Catalog Envelopes, Brown Kraft, Ungummed Open‑End Mailers for Large Documents & Flat Items, 25/Box~#|#~s1224479_sc7Staples 14 x 18 Jumbo Catalog Envelopes, Brown Kraft, Ungummed Open‑End Mailers for Large Documents & Flat Items, 25/Box~#|#~s1224538_sc7
Item: 195776
Model: ST50154-CC
Price is $28.69
Unit of measure 25/Pack
Next-Day Delivery by tomorrow
30-min pickup
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Staples 9.5 x 12.5 Kraft Clasp Envelopes, Brown, Heavyweight Open‑End Mailers with Metal Clasp & Gummed Flap, 100/Box~#|#~E968CCD2-6185-4CD2-B55B622EE7927DD1_sc7Staples 9.5 x 12.5 Kraft Clasp Envelopes, Brown, Heavyweight Open‑End Mailers with Metal Clasp & Gummed Flap, 100/Box~#|#~ACFEF361-8B3E-4AE3-9E357B00F9DC63E3_sc7
Item: 535013
Model: ST17745-CC
Price is $43.99
Unit of measure 100/Box Price per unit $0.44/Envelope
Free Next-Day eligible by tomorrow
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Staples 10 x 13 Heavy‑Duty Clasp Catalog Envelopes, 32 lb Manila Kraft, Reinforced Metal Clasp & Gummed Seal, 100/Box~#|#~s1223301_sc7Staples 10 x 13 Heavy‑Duty Clasp Catalog Envelopes, 32 lb Manila Kraft, Reinforced Metal Clasp & Gummed Seal, 100/Box~#|#~D98982BD-1FCD-4949-924842469CF06D14_sc7
Item: 122069
Model: ST122069-CC
Price is $46.79
Unit of measure 100/Box Price per unit $0.47/Envelope
Free Next-Day eligible by tomorrow
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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_sc7Quality 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
Price is $91.39
Unit of measure 250/Pack
Free delivery by Mon, Jul 27
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Staples 9 x 12 EasyClose Catalog Envelopes, White Wove, Self‑Seal, Heavyweight Document Mailing Envelopes, 250/Box~#|#~s1224571_sc7
Item: 479885
Model: ST479885N-CC
Price is $53.99
Unit of measure 250/Box Price per unit $0.22/Envelope
Free Next-Day eligible by tomorrow
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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
Price is $90.19
Unit of measure 250/Pack
Free delivery by Mon, Jul 27
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Staples Tyvek EasyClose Catalog Envelopes, 9"L x 12"H, White with Green Diamond Border, 100/Box (ST19856)~#|#~sp37727757_sc7Staples Tyvek EasyClose Catalog Envelopes, 9"L x 12"H, White with Green Diamond Border, 100/Box (ST19856)~#|#~sp37727756_sc7
Item: 534958
Model: ST19856
Price is $101.99
Unit of measure 100/Box Price per unit $1.02/Envelope
Free Next-Day eligible by tomorrow
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Staples 6.5 x 9.5 Kraft Catalog Envelopes, Brown, Durable Heavyweight Mailing Envelopes for Documents & Small Inserts, 100/Box~#|#~s1224528_sc7
Item: 534701
Model: ST50162-CC
Price is $34.89
Unit of measure 100/Box
Next-Day Delivery by tomorrow
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Staples 9 x 12 Gummed Catalog Envelopes, White Wove, Strong Adhesive Flap, Durable Mailing Envelopes, 250/Box~#|#~s1224587_sc7
Item: 486949
Model: ST486949R-CC
Price is $53.99
Unit of measure 250/Box Price per unit $0.22/Envelope
Free Next-Day eligible by tomorrow
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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, 50/Pack (24529-50)~#|#~sp5822112_sc7Quality Park Redi-Seal Self Seal Security Tinted #9 Double Window Envelope, 3 7/8" x 8 7/8", White Wove, 50/Pack (24529-50)~#|#~s1196808_sc7
Item: 23996120
Model: 24529-50
Price is $40.09
Unit of measure 50/Pack
Free delivery by Mon, Jul 27
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LUX Double Window Envelope, 3 5/8" x 8 7/8", Bright White, 250/Pack (57633-250)~#|#~sp14807327_sc7
Item: 24261333
Model: 57633-250
Price is $92.49
Unit of measure 250/Pack
Free delivery by Mon, Jul 27
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LUX Peel & Seel Self Seal #10 Window Envelope, 4 1/2" x 9 1/2", White, 50/Pack (75761-50)~#|#~sp14807363_sc7
Item: 24260686
Model: 75761-50
Price is $26.09
Unit of measure 50/Pack
Delivery by Mon, Jul 27
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Staples Self Seal Catalog Envelopes, 10"L x 13"H, White, 100/Box (21571)~#|#~2BCC85DC-6F27-4BEF-B606BC5C93B925E3_sc7Staples Self Seal Catalog Envelopes, 10"L x 13"H, White, 100/Box (21571)~#|#~4377B21E-23BF-41CC-85D64F7A218A7986_sc7
Item: 329850
Model: ST21571-CC
Price is $90.49
Unit of measure 100/Box Price per unit $0.90/Envelope
Free Next-Day eligible by tomorrow
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Staples Gummed Kraft Catalog Envelopes, 6" x 9", Brown, 500/Box (ST381944-CC)~#|#~s1224539_sc7Staples Gummed Kraft Catalog Envelopes, 6" x 9", Brown, 500/Box (ST381944-CC)~#|#~s1224619_sc7
Item: 381944
Model: ST381944-CC
Price is $49.89
Unit of measure 500/Box Price per unit $0.10/Envelope
Free Next-Day eligible by tomorrow
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Staples 9 x 12 Self‑Seal Catalog Envelopes, Brown Kraft, Heavy‑Duty Mailing Envelopes, Secure Peel & Seal Closure, 250/Box~#|#~s1224508_sc7
Item: 486931
Model: ST486931-CC
Price is $71.79
Unit of measure 250/Box Price per unit $0.29/Envelope
Free Next-Day eligible by tomorrow
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Staples Self Seal Security Tinted Catalog Envelopes, 9" x 12", White, 100/Box (21574)~#|#~AF163F2A-06DD-4CF6-9E41767088802991_sc7Staples Self Seal Security Tinted Catalog Envelopes, 9" x 12", White, 100/Box (21574)~#|#~232984CB-C05E-4DBB-A6F2212997A74DC9_sc7
Item: 329845
Model: ST21574-CC
Price is $88.39
Unit of measure 100/Box Price per unit $0.88/Envelope
Free Next-Day eligible by tomorrow
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Staples 10 x 13 Clasp & Moistenable Glue Catalog Envelopes, Natural Brown Kraft, Heavy‑Duty Metal Clasp & Gummed Seal, 100/Box~#|#~E35F2DAD-7680-4936-87A8A1B93062CC8F_sc7Staples 10 x 13 Clasp & Moistenable Glue Catalog Envelopes, Natural Brown Kraft, Heavy‑Duty Metal Clasp & Gummed Seal, 100/Box~#|#~12D57063-F2E2-49F8-86C20951AD1C0391_sc7
Item: 884782
Model: ST19965
Price is $36.19
Unit of measure 100/Box
Free Next-Day eligible by tomorrow
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Staples 10 x 13 White Wove Clasp & Gummed Catalog Envelopes, Metal Clasp Closure, Durable Large Mailing Envelopes, 100/Box~#|#~9AB4797E-631F-4BD0-A0BDD7F74D0F2D46_sc7Staples 10 x 13 White Wove Clasp & Gummed Catalog Envelopes, Metal Clasp Closure, Durable Large Mailing Envelopes, 100/Box~#|#~5018FFCA-4FFD-4A76-8F24EDE2471A7CC7_sc7
Item: 570231
Model: ST570231N-CC
Price is $42.99
Unit of measure 100/Box
Free Next-Day eligible by tomorrow
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Staples 5 x 5 White Open‑End CD/DVD Envelopes, Protective Media Sleeves, 50/Box~#|#~9EDB4B2F-CCE2-4A77-AE8DC4F85D10FB27_sc7Staples 5 x 5 White Open‑End CD/DVD Envelopes, Protective Media Sleeves, 50/Box~#|#~C560EFB7-1918-4376-A28DD11D5D228A9E_sc7
Item: 459599
Model: ST12257-CC
Price is $12.09
Unit of measure 50/Box Price per unit $0.24/Envelope
Next-Day Delivery by tomorrow
30-min pickup
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Quality Park Self Seal A2 Invitation Envelope 4 3/8" x 5 3/4", White, 100/Box (QUA10740)~#|#~sp43812739_sc7Quality Park Self Seal A2 Invitation Envelope 4 3/8" x 5 3/4", White, 100/Box (QUA10740)~#|#~sp43812738_sc7
Item: 582032
Model: QUA10740
Price is $25.59
Unit of measure 100/Box
Next-Day Delivery by tomorrow
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Staples First Class Self Seal #13 Envelope, 10" x 13", White with green diamond border, 100/Box (ST195032-CC)~#|#~B9E43806-A13F-42A4-9B33EF8939143347_sc7Staples First Class Self Seal #13 Envelope, 10" x 13", White with green diamond border, 100/Box (ST195032-CC)~#|#~B114CDC0-F53A-44C8-B7FBE317A7591DCF_sc7
Item: 195032
Model: ST195032-CC
Price is $45.79
Unit of measure 100/Box
Free Next-Day eligible by tomorrow
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Staples 9 x 12 Catalog Envelopes, Brown Kraft, Gummed Seal, Heavy‑Duty Mailing Envelopes for Documents & Forms, 250/Box~#|#~s1224512_sc7
Item: 486940
Model: ST486940-CC
Price is $55.19
Unit of measure 250/Box
Free Next-Day eligible by tomorrow
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Quality Park Tyvek Flap-Stik Self Seal Catalog Envelope, 9" x 12", White, 50/Box (QUAR1462)~#|#~s0171511_sc7
Item: 901463
Model: QUAR1462
Price is $122.99
Unit of measure 50/Box Price per unit $2.46/Envelope
Free Next-Day eligible by tomorrow
30-min pickup
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Staples Self Seal Catalog Envelopes, 12" x 15.5", White, 100/Box (609123/73142)~#|#~222A2E50-FD44-4AA9-A348097CFAF63B66_sc7Staples Self Seal Catalog Envelopes, 12" x 15.5", White, 100/Box (609123/73142)~#|#~3F280CCA-0192-4AC5-ABDE8803F67EC0C3_sc7
Item: 609123
Model: ST609123-CC
Price is $39.29
Unit of measure 100/Box
Free Next-Day eligible 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.