Sponsored Products
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Square Envelopes

JAM Paper Gummed A7 Invitation Envelopes, 5 1/4" x 7 1/4", White, 25/Pack (73767)~#|#~sp70241006_sc7JAM Paper Gummed A7 Invitation Envelopes, 5 1/4" x 7 1/4", White, 25/Pack (73767)~#|#~sp70241005_sc7
Item: 365929
Model: 73767
Price is $8.19
Unit of measure 25/Pack
Delivery by Wed, Jul 22
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Staples 9 x 12 EasyClose Catalog Envelopes, Brown Kraft, Self‑Seal, Durable Heavyweight Mailing Envelopes, 250/Box~#|#~s1224495_sc7
Item: 479888
Model: ST479888-CC
Price is $66.29
Unit of measure 250/Box Price per unit $0.26/Envelope
Free delivery by Mon, Jul 20
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Staples Gummed Catalog Envelopes, 9" x 12", White, 25/Pack (ST579712N-CC)~#|#~s1224537_sc7Staples Gummed Catalog Envelopes, 9" x 12", White, 25/Pack (ST579712N-CC)~#|#~s1224546_sc7
Item: 579712
Model: ST579712N-CC
Price is $11.29
Unit of measure 25/Pack
Delivery by Mon, Jul 20
30-min pickup
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Staples EasyClose Catalog Envelopes, 10"L x 13"H, White, 250/Box (SPL479886)~#|#~s1224630_sc7Staples EasyClose Catalog Envelopes, 10"L x 13"H, White, 250/Box (SPL479886)~#|#~s1224574_sc7
Item: 479886
Model: ST19785-CC
Price is $53.99
Unit of measure 250/Box
Free delivery by Mon, Jul 20
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JAM Paper Self-Seal Catalog Envelope 10" x 13", Brown Kraft Manila, 100/Pack (13034233D)~#|#~FC4A4974-E404-47B4-857A31AC4A500A39_sc7
Item: 24557999
Model: 13034233D
Price is $45.19
Unit of measure 100/Pack
Free delivery by Wed, Jul 22
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JAM Paper A9 Invitation Envelope, 5 3/4" x 8 3/4", White, 100/Pack (4023213C)~#|#~m002934506_sc7JAM Paper A9 Invitation Envelope, 5 3/4" x 8 3/4", White, 100/Pack (4023213C)~#|#~m002934505_sc7
Item: 2103322
Model: 4023213C
Price is $29.09
Unit of measure 100/Pack
Delivery by Wed, Jul 22
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Staples EasyClose Booklet Envelopes, 6" × 9", White, Self‑Seal Closure, Durable Paper Stock, 250/Box~#|#~599BB8BC-D424-47B7-9A797CE6D154AC4F_sc7Staples EasyClose Booklet Envelopes, 6" × 9", White, Self‑Seal Closure, Durable Paper Stock, 250/Box~#|#~D2D35CE7-9235-4C11-9294C7A1362B8A2C_sc7
Item: 570225
Model: ST50157
Price is $51.99
Unit of measure 250/Box Price per unit $0.21/Envelope
Free delivery by Mon, Jul 20
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Staples #10 White Security‑Tinted Business Envelopes, Self‑Seal, Premium Office Mailing Envelopes, 500/Pack~#|#~31B0C6F7-91DE-4E95-A11E3670DC5F2DD8_sc7Staples #10 White Security‑Tinted Business Envelopes, Self‑Seal, Premium Office Mailing Envelopes, 500/Pack~#|#~73F89DCA-30B6-46FA-B098CD35CE9CBEC8_sc7
Item: 511289
Model: ST511289-CC
Price is $30.99
Unit of measure 500/Box Price per unit $0.06/Envelope
Delivery by Mon, Jul 20
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Staples 6 x 9 EasyClose Catalog Envelopes, Kraft, Self‑Seal Closure, Strong Mailing Envelopes for Small Documents, 100/Box~#|#~s1224581_sc7Staples 6 x 9 EasyClose Catalog Envelopes, Kraft, Self‑Seal Closure, Strong Mailing Envelopes for Small Documents, 100/Box~#|#~s1224583_sc7
Item: 892100
Model: ST20140/20140
Price is $22.19
Unit of measure 100/Box
Delivery by Mon, Jul 20
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JAM Paper Catalog Envelope 10.5" x 7.5", White, 50/Pack (4120H)~#|#~sp111772311_sc7JAM Paper Catalog Envelope 10.5" x 7.5", White, 50/Pack (4120H)~#|#~sp111772310_sc7
Item: 2329373
Model: 4120H
Price is $14.89
Unit of measure 50/Pack
Delivery by Wed, Jul 22
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JAM Paper 5.5 x 7.5 Open End Kraft Catalog Envelopes, Brown Kraft Manila, 50/Pack (4101i)~#|#~sp111772307_sc7JAM Paper 5.5 x 7.5 Open End Kraft Catalog Envelopes, Brown Kraft Manila, 50/Pack (4101i)~#|#~sp111772306_sc7
Item: 24142036
Model: 4101I
Price is $17.09
Unit of measure 50/Pack
Delivery by Wed, Jul 22
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JAM Paper Open End Nonstandard Kraft Catalog Envelope, 9" x 12", Brown Kraft, 100/Pack (4132)~#|#~7922461B-7ADE-4E1E-A5CA147A85F66585_sc7JAM Paper Open End Nonstandard Kraft Catalog Envelope, 9" x 12", Brown Kraft, 100/Pack (4132)~#|#~sp112937327_sc7
Item: 2636940
Model: 4132
Price is $29.49
Unit of measure 100/Pack Price per unit $0.30/Envelope
Delivery by Wed, Jul 22
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Staples Laser Check Double‑Window Business Envelopes, White, Security‑Tinted Gummed Closure, 8 7/8" x 3 5/8", 500/Pack~#|#~C39630DD-6A75-47E8-8D8FD913E48BEAD0_sc7Staples Laser Check Double‑Window Business Envelopes, White, Security‑Tinted Gummed Closure, 8 7/8" x 3 5/8", 500/Pack~#|#~79F8C193-D873-4D92-AF21E923C116C374_sc7
Item: 394062
Model: ST394062-CC
Price is $30.49
Unit of measure 500/Box Price per unit $0.06/Envelope
Delivery by Mon, Jul 20
30-min pickup
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Quality Park Clasp Catalog Envelope, 10" x 13", Kraft, 250/Box (37597)~#|#~s0293058_sc7Quality Park Clasp Catalog Envelope, 10" x 13", Kraft, 250/Box (37597)~#|#~s0171250_sc7
Item: QUA37597
Model: QUA37597
No reviews yet
Price is $223.02
Unit of measure Box
Free delivery by Tue, Jul 21
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Staples #10 EasyClose Envelopes, White, Self‑Seal, Standard Business Mailers, 100/Box~#|#~888BE6B1-31CD-47C0-A8C1657439776121_sc7Staples #10 EasyClose Envelopes, White, Self‑Seal, Standard Business Mailers, 100/Box~#|#~DDE921C8-55FF-44C0-B2C5590B29C8AE44_sc7
Item: 394053
Model: ST50307-CC
Price is $11.49
Unit of measure 100/Box Price per unit $0.12/Envelope
Delivery by Mon, Jul 20
30-min pickup
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LUX A1 Invitation Envelopes (3 5/8 x 5 1/8) 50/Box, Baby Blue (EX4865-13-50)~#|#~m000081687_sc7
Item: 282349
Model: EX4865-13-50
No reviews yet
Price is $13.99
Unit of measure 50/Pack
Delivery by Tue, Jul 21
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LUX #1 Coin Envelopes (2 1/4 x 3 1/2) 50/Box, Taupe Metallic (1CO-M09-50)~#|#~m004846886_sc7
Item: 2444729
Model: 1CO-M09-50
No reviews yet
Price is $22.99
Unit of measure 50/Pack
Delivery by Tue, Jul 21
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JAM Paper #7 Kraft Coin Envelope, 3 1/2" x 6 1/2", Brown Kraft, 50/Pack (95125I)~#|#~sp64338509_sc7JAM Paper #7 Kraft Coin Envelope, 3 1/2" x 6 1/2", Brown Kraft, 50/Pack (95125I)~#|#~sp64338508_sc7
Item: 2633114
Model: 95125I
Price is $10.39
Unit of measure 50/Pack
Delivery by Wed, Jul 22
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Quality Park Clasp Catalog Envelope, 6 1/2" x 9 1/2", Kraft, 100/Box (37863)~#|#~s0462609_sc7
Item: QUA37863
Model: QUA37863
Price is $35.35
Unit of measure Box
Free delivery by Thu, Jul 23
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Staples First Class EasyClose Catalog Envelopes, 9"L x 12"H, White and Green, 100/Box (SPL486929)~#|#~s1224518_sc7Staples First Class EasyClose Catalog Envelopes, 9"L x 12"H, White and Green, 100/Box (SPL486929)~#|#~s1224514_sc7
Item: 486929
Model: ST50191-CC
Price is $39.79
Unit of measure 100/Box Price per unit $0.40/Envelope
Free delivery by Mon, Jul 20
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JAM Paper Gummed A2 Invitation Envelopes, 5 3/4" x 4 3/8", White, 100/Pack (MOOP6250LDIC)~#|#~sp64339628_sc7JAM Paper Gummed A2 Invitation Envelopes, 5 3/4" x 4 3/8", White, 100/Pack (MOOP6250LDIC)~#|#~sp64340093_sc7
Item: 2103327
Model: MOOP6250LDIC
Price is $24.49
Unit of measure 100/Pack
Delivery by Wed, Jul 22
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Staples #10 Left‑Window EasyClose Business Envelopes, White, Peel & Seal, 9.5" x 4.125", 500/Pack~#|#~087AFA6B-1E2E-41EA-93402D001D8DF84A_sc7
Item: 381936
Model: ST381936/381936
Price is $35.39
Unit of measure 500/Box Price per unit $0.07/Envelope
Free delivery by Mon, Jul 20
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Staples 6 x 9 Self‑Sealing Catalog Envelopes, Brown Kraft, Strong Peel & Seal Closure, Heavyweight Mailing Envelopes, 100/Box~#|#~s1224544_sc7Staples 6 x 9 Self‑Sealing Catalog Envelopes, Brown Kraft, Strong Peel & Seal Closure, Heavyweight Mailing Envelopes, 100/Box~#|#~s1224543_sc7
Item: 381964
Model: ST50262-CC
Price is $29.99
Unit of measure 100/Box Price per unit $0.30/Envelope
Delivery by Mon, Jul 20
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LUX #1 Coin Envelopes (2 1/4 x 3 1/2) 50/Box, Holiday Green (LUX-1CO-L17-50)~#|#~m001149688_sc7
Item: 1030043
Model: LUX-1CO-L17-50
Price is $23.89
Delivery by Tue, Jul 21
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JAM Paper #6 Kraft Coin Business Envelopes, 3.375 x 6, Brown Kraft Manila, 50/Pack (1623992i)~#|#~sp111772366_sc7JAM Paper #6 Kraft Coin Business Envelopes, 3.375 x 6, Brown Kraft Manila, 50/Pack (1623992i)~#|#~sp111772506_sc7
Item: 2633117
Model: 1623992I
Price is $14.89
Unit of measure 50/Pack
Delivery by Wed, Jul 22
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JAM Paper A9 Invitation Envelopes, 5.75 x 8.75, White, 25/Pack (4023213)~#|#~m003904861_sc7JAM Paper A9 Invitation Envelopes, 5.75 x 8.75, White, 25/Pack (4023213)~#|#~m003904860_sc7
Item: 366015
Model: 4023213
Price is $9.49
Unit of measure 25/Pack
Delivery by Wed, Jul 22
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Staples Adhesive Inter‑Departmental Envelopes, 10" × 13", Brown Kraft, Self‑Adhesive Closure, 100/Box~#|#~F9261A1D-5B3F-4B12-8244C640E93F0C5E_sc7
Item: 391542
Model: ST19852-CC
Price is $36.79
Unit of measure 100/Box
Free delivery by Mon, Jul 20
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JAM Paper A7 Invitation Envelope, 5 1/4" x 7 1/4", Red, 25/Pack (15945)~#|#~m002934113_sc7JAM Paper A7 Invitation Envelope, 5 1/4" x 7 1/4", Red, 25/Pack (15945)~#|#~m002934112_sc7
Item: 260829
Model: 15945
Price is $10.29
Unit of measure 25/Pack
Delivery by Wed, Jul 22
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LUX A7 Invitation Envelopes (5 1/4 x 7 1/4) 50/Box, Navy (LUX-4880-103-50)~#|#~m005902344_sc7LUX A7 Invitation Envelopes (5 1/4 x 7 1/4) 50/Box, Navy (LUX-4880-103-50)~#|#~m005823963_sc7
Item: 282797
Model: LUX-4880-103-50
Price is $22.59
Unit of measure 50/Pack
Delivery by Tue, Jul 21
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LUX Self Seal A7 Invitation Envelope 5 1/4" x 7 1/4", Avocado Green, 50/Pack (EX4880-27-50)~#|#~F9C42045-9B12-49F2-B3303E6C11ADB6CB_sc7LUX Self Seal A7 Invitation Envelope 5 1/4" x 7 1/4", Avocado Green, 50/Pack (EX4880-27-50)~#|#~799990B4-4014-4F33-A54AB2EC77B40009_sc7
Item: 282729
Model: EX4880-27-50
No reviews yet
Price is $31.29
Unit of measure 50/Pack
Delivery by Tue, Jul 21
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Staples 9 x 12 Self‑Seal Catalog Envelopes, Brown Kraft, Strong Secure Seal, Heavyweight Mailing Envelopes, 100/Box~#|#~8F04272A-2149-420C-9D7DFC65633D51B8_sc7Staples 9 x 12 Self‑Seal Catalog Envelopes, Brown Kraft, Strong Secure Seal, Heavyweight Mailing Envelopes, 100/Box~#|#~BD24A3C7-A3F5-42F1-85B5B001F34A5072_sc7
Item: 534800
Model: ST534800-CC
Price is $33.19
Unit of measure 100/Box
Delivery by Mon, Jul 20
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Quality Park Redi-Seal Kraft Catalog Envelope, 9" x 12", Brown, 100/Box (43511)~#|#~s0341571_sc7
Item: 802220
Model: QUA43511
Price is $25.99
Unit of measure 100/Box
Delivery by Tue, Jul 21
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Staples 10 x 13 Kraft Clasp & Gummed Catalog Envelopes, Brown Manila, Strong Metal Clasp Closure, 250/Box~#|#~727091CB-2EA2-4E82-A163783983888D26_sc7
Item: 487494
Model: ST487494-CC
Price is $74.79
Unit of measure 250/Box Price per unit $0.30/Envelope
Free delivery by Mon, Jul 20
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Staples Booklet Envelopes, 6" × 9", Side‑Opening, Gummed Flap, White Wove Paper, 250/Box~#|#~038B3DE6-4E4D-4BE5-9C4D6E42BA7860C6_sc7Staples Booklet Envelopes, 6" × 9", Side‑Opening, Gummed Flap, White Wove Paper, 250/Box~#|#~BDA8191C-C984-42E0-9077BC227644B0F7_sc7
Item: 472852
Model: ST472852-CC
Price is $45.99
Unit of measure 250/Box Price per unit $0.18/Envelope
Free delivery by Mon, Jul 20
30-min pickup
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Staples Neon Assorted #10 EasyClose Envelopes, 4 1/8" x 9 1/2", Bright Color Mailing Envelopes, 50/Pack~#|#~5C561CBB-1963-4D64-A85EEA57A8AF559B_sc7Staples Neon Assorted #10 EasyClose Envelopes, 4 1/8" x 9 1/2", Bright Color Mailing Envelopes, 50/Pack~#|#~F7756BA6-CC51-48E2-AF9D153F6450886B_sc7
Item: 122725
Model: ST23431-CC
Price is $11.79
Unit of measure 50/Pack
Delivery by Mon, Jul 20
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LUX 11 1/2 x 14 1/2 Open End Envelopes 50/Pack, 28lb. Bright White (4166-50)~#|#~sp14807484_sc7
Item: 24261049
Model: 4166-50
Price is $45.09
Unit of measure 50/Pack
Free delivery by Tue, Jul 21
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Staples Kraft Catalog Envelopes, 6" x 9", Manila, 100/Box (918765/19381)~#|#~962003A1-4C21-42FB-8D65365FE763202C_sc7Staples Kraft Catalog Envelopes, 6" x 9", Manila, 100/Box (918765/19381)~#|#~FD91972A-05A3-428C-AF19005AA385028D_sc7
Item: 918765
Model: ST918765-CC
Price is $20.59
Unit of measure 100/Box Price per unit $0.21/Envelope
Delivery by Mon, Jul 20
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LUX #9 Window Envelopes, 3 7/8" x 8 7/8", White w/ Simple Seal, 50 Qty (45313-50)~#|#~m004064011_sc7
LUX #9 Window Envelopes, 3 7/8" x 8 7/8", White w/ Simple Seal, 50 Qty (45313-50) is Out of stock
Item: 2146254
Model: 45313-50
No reviews yet
Price is $38.29
Unit of measure 50/Pack

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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.