LUX 80lbs. 4 1/8" x 9 1/2" #10 Square Flap Envelopes, Midnight Black, 250/BX~#|#~m004940475_sc7LUX 80lbs. 4 1/8" x 9 1/2" #10 Square Flap Envelopes, Midnight Black, 250/BX~#|#~m005824009_sc7
Item: 387486
Model: F-4560-B-250
Price is $47.79
Unit of measure 250/Box
Free delivery by Thu, May 07
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LUX 4 x 4 Square 50/Pack, Ruby Red (8504-18-50)~#|#~sp14807904_sc7
Item: 24260632
Model: 8504-18-50
No reviews yet
Price is $13.49
Unit of measure 50/Pack
Delivery by Thu, May 07
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80 lb 5 3/4" x 5 3/4" Peel & Press Square Linen Envelopes, Natural, 50/Pack~#|#~m001149703_sc7
Item: 1030026
Model: 8520-NLI-50
No reviews yet
Price is $21.99
Delivery by Thu, May 07
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LUX 5 x 5 Square Envelopes, 500/Box, Limelight (LUX-8505-101500)~#|#~m000081527_sc7
Item: 517216
Model: LUX-8505-101500
No reviews yet
Price is $77.79
Free delivery by Thu, May 07
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LUX A2 (4 3/8 x 5 3/4) 500/Box, White - 100% Recycled (4870-WPC-500)~#|#~m000161358_sc7
Item: 516334
Model: 4870-WPC-500
Price is $88.69
Free delivery by Thu, May 07
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LUX A4 Invitation Envelopes (4 1/4 x 6 1/4) 50/Box, Limelight (LUX-4872-101-50)~#|#~m000081861_sc7
Item: 282549
Model: LUX-4872-101-50
Price is $13.95
Unit of measure 50/Pack
Delivery by Thu, May 07
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Lux Full Face Envelopes, Wasabi 4.12 x 9.5 inch 1000/Pack~#|#~m002084637_sc7
Item: 1560078
Model: FFW-10-L22-1000
No reviews yet
Price is $253.69
Free delivery by Thu, May 07
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JAM Paper 6 x 6 Square Invitation Envelopes, Dark Red, Bulk 250/Box (31511296H)~#|#~m002934224_sc7JAM Paper 6 x 6 Square Invitation Envelopes, Dark Red, Bulk 250/Box (31511296H)~#|#~m002934223_sc7
Item: 1589826
Model: 31511296H
No reviews yet
Price is $283.99
Unit of measure 250/Box
Free delivery by Tue, May 05
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LUX A1 Invitation Envelopes (3 5/8 x 5 1/8) 50/Box, Seafoam (LUX-4865-113-50)~#|#~m000081735_sc7
Item: 282399
Model: LUX-4865-113-50
No reviews yet
Price is $12.69
Unit of measure 50/Pack
Delivery by Thu, May 07
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JAM Paper A7 Metallic Invitation Envelopes, 5.25 x 7.25, Stardream Malachite Deep Green, Bulk 250/Box (GCST703H)~#|#~m002168965_sc7
Item: 1590152
Model: GCST703H
No reviews yet
Price is $204.69
Unit of measure 250/Box
Free delivery by Tue, May 05
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JAM Paper A2 Invitation Envelopes, 4.375 x 5.75, Baby Pink, 50/Pack (155623I)~#|#~sp132864308_sc7JAM Paper A2 Invitation Envelopes, 4.375 x 5.75, Baby Pink, 50/Pack (155623I)~#|#~sp132864307_sc7
Item: 1589472
Model: 155623I
Price is $22.19
Unit of measure 50/Pack
Delivery by Tue, May 05
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JAM Paper #3 Coin Business Colored Envelopes, 2.5 x 4.25, Ultra Lime Green, 50/Pack (356730536i)~#|#~sp131391312_sc7JAM Paper #3 Coin Business Colored Envelopes, 2.5 x 4.25, Ultra Lime Green, 50/Pack (356730536i)~#|#~sp131391311_sc7
Item: 2478031
Model: 356730536I
No reviews yet
Price is $19.39
Unit of measure 50/Pack
Delivery by Tue, May 05
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JAM Paper 9 x 12 Open End Foil Envelopes with Self-Adhesive Closure, Red Holly, 100/Pack (1333313B)~#|#~m000067492_sc7
Item: 260973
Model: 1333313B
No reviews yet
Price is $158.99
Unit of measure 100/Box
Free delivery by Tue, May 05
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JAM Paper® #5.5 Coin Business Colored Envelopes, 3.125 x 5.5, Red Recycled, 50/Pack (356730551I)JAM Paper® #5.5 Coin Business Colored Envelopes, 3.125 x 5.5, Red Recycled, 50/Pack (356730551I)
Item: 2329354
Model: 356730551I
No reviews yet
Price is $19.39
Unit of measure 50/Pack
Delivery by Tue, May 05
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LUX Exclusive Moistenable Glue #10 Invitation Envelopes, 6 1/2" x 6 1/2", Garnet Red, 250/Box (EX8535-26-250)~#|#~m000081569_sc7
Item: 387389
Model: EX8535-26-250
No reviews yet
Price is $108.59
Unit of measure 250/Box
Free delivery by Thu, May 07
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JAM Paper #5.5 Coin Business Colored Envelopes, 3.125 x 5.5, Blue Recycled, 25/Pack (356730549)~#|#~m003757871_sc7JAM Paper #5.5 Coin Business Colored Envelopes, 3.125 x 5.5, Blue Recycled, 25/Pack (356730549)~#|#~m003562857_sc7
Item: 2103445
Model: 356730549
No reviews yet
Price is $11.49
Unit of measure 25/Pack
Delivery by Tue, May 05
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JAM Paper 6.5 x 6.5 Square Invitation Envelopes, White, 50/Pack (28417I)~#|#~m007049353_sc7JAM Paper 6.5 x 6.5 Square Invitation Envelopes, White, 50/Pack (28417I)~#|#~m007049352_sc7
Item: 1588508
Model: 28417I
Price is $44.19
Unit of measure 50/Pack
Free delivery by Tue, May 05
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JAM Paper 4Bar A1 Translucent Vellum Invitation Envelopes, 3.625 x 5.125, Primary Yellow, 50/Pack (1591616I)~#|#~m003904760_sc7JAM Paper 4Bar A1 Translucent Vellum Invitation Envelopes, 3.625 x 5.125, Primary Yellow, 50/Pack (1591616I)~#|#~m003904759_sc7
Item: 1588799
Model: 1591616I
No reviews yet
Price is $39.99
Unit of measure 50/Pack
Free delivery by Tue, May 05
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LUX A1 Invitation Envelopes (3 5/8 x 5 1/8) 1000/Box, Garnet (EX4865-26-1000)~#|#~m000081704_sc7
Item: 386422
Model: EX4865-26-1000
No reviews yet
Price is $151.99
Unit of measure 1000/Box
Free delivery by Thu, May 07
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JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Teal Blue, 25/Pack (63924024)~#|#~sp132864328_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Teal Blue, 25/Pack (63924024)~#|#~sp132864327_sc7
Item: 1227786
Model: 63924024
No reviews yet
Price is $19.49
Unit of measure 25/Pack
Delivery by Tue, May 05
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JAM Paper® #1 Coin Business Colored Envelopes, 2.25 x 3.5, Blue Recycled, 100/Pack (352727818F)~#|#~sp123307716_sc7JAM Paper® #1 Coin Business Colored Envelopes, 2.25 x 3.5, Blue Recycled, 100/Pack (352727818F)~#|#~sp123307624_sc7
Item: 24364869
Model: 352727818F
No reviews yet
Price is $38.49
Unit of measure 100/Pack
Free delivery by Tue, May 05
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LUX 60lbs. 4 1/8" x 9 1/2" #10 Business Envelopes, White With Silver LUX Lining, 250/BX~#|#~m000081264_sc7
Item: 387906
Model: FLWH4260-03-250
No reviews yet
Price is $66.29
Unit of measure 250/Box
Free delivery by Thu, May 07
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LUX 6 1/2 x 6 1/2 Square Envelopes 50/Pack, Pool (LUX-8535-102-50)~#|#~sp14807804_sc7
Item: 24260434
Model: LUX-8535-102-50
No reviews yet
Price is $23.09
Unit of measure 50/Pack
Delivery by Thu, May 07
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LUX 6 1/2 x 6 1/2 Foil Lined Square Envelopes, 50/Box, White w/Red LUX Lining (FLWH8535-01-50)~#|#~m000081599_sc7
Item: 282242
Model: FLWH8535-01-50
No reviews yet
Price is $25.89
Unit of measure 50/Pack
Delivery by Thu, May 07
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LUX 70lbs. 10" x 13" Open End Envelopes, Smoke Gray, 500/BX (EX4897-22-500)~#|#~8F50DF73-7F35-4A31-AE15383A966F24C3_sc7
Item: 386880
Model: EX4897-22-500
No reviews yet
Price is $197.59
Unit of measure 500/Box
Free delivery by Thu, May 07
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LUX A8 Invitation Envelopes (5 1/2 x 8 1/8) 50/Box, 80lb. Bright White (FE4585-05-50)~#|#~m000082125_sc7
Item: 282877
Model: FE4585-05-50
No reviews yet
Price is $32.29
Unit of measure 50/Pack
Delivery by Thu, May 07
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JAM Paper Cellophane Envelope with Self-Adhesive Closure, 8.625 x 8.625, Clear, 1000/Carton (8.62X8.62CELLOB)~#|#~m000068414_sc7
Item: 262944
Model: 8.62X8.62CELLOB
No reviews yet
Price is $416.99
Unit of measure 1000/Carton
Free delivery by Tue, May 05
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JAM Paper 6.5 x 6.5 Square Translucent Vellum Invitation Envelopes, Heavy Metal, 25/Pack (1592109)~#|#~sp137086024_sc7
Item: 263780
Model: 1592109
No reviews yet
Price is $30.99
Unit of measure 25/Pack
Delivery by Tue, May 05
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LUX 5 x 5 Square Envelopes, 50/Box, Pool (LUX-8505-102-50)~#|#~m000081532_sc7
Item: 282166
Model: LUX-8505-102-50
No reviews yet
Price is $14.95
Unit of measure 50/Pack
Delivery by Thu, May 07
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LUX A6 Invitation Envelopes (4 3/4 x 6 1/2) 50/Box, Anthracite Metallic (5375-15-50)~#|#~m000081893_sc7
Item: 282585
Model: 5375-15-50
No reviews yet
Price is $22.95
Unit of measure 50/Pack
Delivery by Thu, May 07
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LUX Self Seal #10 Window Envelope, 4 1/8" x 9 1/2", Midnight Black, 250/Pack (FFW-10-B-250)~#|#~m002084694_sc7
Item: 1559058
Model: FFW-10-B-250
No reviews yet
Price is $90.79
Free delivery by Thu, May 07
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JAM Paper 7.5 x 7.5 Square Colored Invitation Envelopes, Red Recycled, Bulk 250/Box (2792291H)~#|#~m002934107_sc7JAM Paper 7.5 x 7.5 Square Colored Invitation Envelopes, Red Recycled, Bulk 250/Box (2792291H)~#|#~m002934106_sc7
Item: 1589722
Model: 2792291H
No reviews yet
Price is $236.99
Unit of measure 250/Box
Free delivery by Tue, May 05
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JAM Paper 2.375 x 2.375 Mini Square Envelopes, White, Bulk 1000/Carton (03993004C)~#|#~sp137086853_sc7JAM Paper 2.375 x 2.375 Mini Square Envelopes, White, Bulk 1000/Carton (03993004C)~#|#~sp137086231_sc7
Item: 261334
Model: 03993004C
No reviews yet
Price is $227.99
Unit of measure 1000/Carton
Free delivery by Tue, May 05
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LUX 4 3/4" x 6 1/2" A6 Invitation Envelopes W/Peel & Press, White/Gold LUX, 1000/BX~#|#~m000081967_sc7
Item: 388449
Model: FLWH4875-04-100
No reviews yet
Price is $161.99
Unit of measure 1000/Box
Free delivery by Thu, May 07
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LUX 9 x 12 Open End Envelopes 500/Pack, 28lb. Bright White (8250-500)~#|#~sp14807488_sc7
Item: 24260336
Model: 8250-500
Price is $103.69
Unit of measure 500/Pack
Free delivery by Thu, May 07
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LUX 80lbs. 4 3/4" x 6 1/2" A6 Invitation Envelopes W/Peel & Press, Vintage Plum Purple, 250/BX~#|#~m000081963_sc7
Item: 388636
Model: LUX-4875-104-25
No reviews yet
Price is $62.79
Unit of measure 250/Box
Free delivery by Thu, May 07
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JAM Paper 9 x 9 Square Invitation Envelopes, White, 100/Pack (4232B)~#|#~sp115352016_sc7JAM Paper 9 x 9 Square Invitation Envelopes, White, 100/Pack (4232B)~#|#~sp115352015_sc7
Item: 261327
Model: 4232B
No reviews yet
Price is $53.19
Unit of measure 100/Box
Free delivery by Tue, May 05
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LUX 9 x 12 Kraft Open End Envelopes w/Security Tint, 28lb. White, 50/Box (WS-4894-ST-50)~#|#~m004063773_sc7
Item: 2146105
Model: WS-4894-ST-50
No reviews yet
Price is $41.99
Unit of measure 50/Pack
Free delivery by Thu, May 07
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JAM Paper 6 x 9 Open End Catalog Colored Envelopes, Orange Recycled, 100/Pack (88129)~#|#~m003904668_sc7JAM Paper 6 x 9 Open End Catalog Colored Envelopes, Orange Recycled, 100/Pack (88129)~#|#~m003904667_sc7
Item: 261681
Model: 88129
Price is $45.19
Unit of measure 100/Box
Free delivery by Tue, May 05
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Quality Park Booklet Envelope 6" x 9", White, 500/Box (QUA37181)~#|#~s0511674_sc7
Quality Park Booklet Envelope 6" x 9", White, 500/Box (QUA37181) is Out of stock
Item: 901454
Model: QUA37181
No reviews yet
Price is $65.69
Unit of measure 500/Box
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.