Sponsored Products
Page 1 of 1

Commercial Envelopes

Staples #10 Security‑Tinted Window Business Envelopes, White, Self‑Seal Closure, 500/Pack~#|#~B6194FD8-5648-4635-99667B39584BE7A4_sc7Staples #10 Security‑Tinted Window Business Envelopes, White, Self‑Seal Closure, 500/Pack~#|#~5DE37CBF-6992-4DE5-B92473C21A89EF98_sc7
Item: 918161
Model: ST50152-CC
Price is $37.09
Unit of measure 500/Box Price per unit $0.07/Envelope
Free Next-Day eligible by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #8‑5/8 Left‑Window Security‑Tinted Check Envelopes, White, Gummed Seal, 500/Box~#|#~82CEBB0E-C30F-4620-AA058DD6BAEBCED1_sc7Staples #8‑5/8 Left‑Window Security‑Tinted Check Envelopes, White, Gummed Seal, 500/Box~#|#~57E0B642-E060-48F5-A7A3105C827013DE_sc7
Item: 918179
Model: ST918179-CC
Price is $43.79
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #9 Double‑Window Security‑Tinted Invoice Envelopes, White, Gummed Closure, 500/Box~#|#~CA8F9A39-0429-4A16-A4C553898A110D20_sc7Staples #9 Double‑Window Security‑Tinted Invoice Envelopes, White, Gummed Closure, 500/Box~#|#~FD84E347-9FA6-446D-AEC7787B89913917_sc7
Item: 266759
Model: ST266759-CC
Price is $31.89
Unit of measure 500/Box Price per unit $0.06/Envelope
Next-Day Delivery by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #10 Double‑Window Security‑Tinted Business Envelopes, White, Gummed Closure, 9.5" x 4.125", 500/Pack~#|#~AE1BB140-9743-4C67-BBE1972255DDD93E_sc7Staples #10 Double‑Window Security‑Tinted Business Envelopes, White, Gummed Closure, 9.5" x 4.125", 500/Pack~#|#~91389021-99C1-4B5E-AB395FCAE6404667_sc7
Item: 892095
Model: ST20137
Price is $34.29
Unit of measure 500/Box Price per unit $0.07/Envelope
Next-Day Delivery by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #10 Left‑Window Business Envelopes, White, Gummed Closure, 9.5" x 4.125", 500/Pack~#|#~A585D404-8395-4AA8-8DA22BF660CD9233_sc7Staples #10 Left‑Window Business Envelopes, White, Gummed Closure, 9.5" x 4.125", 500/Pack~#|#~CC8B6986-1619-45AA-BB07FACCB7CE239D_sc7
Item: 121632
Model: ST50151-CC
Price is $43.89
Unit of measure 500/Box Price per unit $0.09/Envelope
Free Next-Day eligible by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper 9" x 12" Open End Catalog Colored Envelopes with Clasp Closure, Orange Recycled, 10/Pack (92938B)~#|#~m003904672_sc7JAM Paper 9" x 12" Open End Catalog Colored Envelopes with Clasp Closure, Orange Recycled, 10/Pack (92938B)~#|#~m003904671_sc7
Item: 38357
Model: 92938B
Price is $15.59
Unit of measure 10/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper 9" x 12" Open End Catalog Colored Envelopes with Clasp Closure, Sea Blue Recycled, 10/Pack (900906997B)~#|#~sp113368659_sc7JAM Paper 9" x 12" Open End Catalog Colored Envelopes with Clasp Closure, Sea Blue Recycled, 10/Pack (900906997B)~#|#~sp113368658_sc7
Item: 38346
Model: 900906997B
No reviews yet
Price is $15.59
Unit of measure 10/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples Plastic Button & String Document Envelopes, Assorted Colors, 5/Pack (TR10782-CC)~#|#~F6688106-A90D-4BC0-BE457ECAAA5581E5_sc7Staples Plastic Button & String Document Envelopes, Assorted Colors, 5/Pack (TR10782-CC)~#|#~B20AA711-D6D0-41A1-BD9064CCAF43722F_sc7
Item: 906380
Model: TR10782-CC
Price is $13.59
Unit of measure 5/Pack Price per unit $2.72/Envelope
Next-Day Delivery by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
LUX Moistenable Glue #10 Window Envelope, 4 1/8" x 9 1/2", Bright White, 50/Pack (82624-50)~#|#~sp14807332_sc7
Item: 24260721
Model: 82624-50
Price is $14.69
Unit of measure 50/Pack
Delivery by Mon, Jul 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #9 Left‑Window Gummed Business Envelopes, White, Standard Office Mailing Envelopes, 500/Box~#|#~7A7DF31B-8D92-4DEF-BB60E63DB1E5B414_sc7Staples #9 Left‑Window Gummed Business Envelopes, White, Standard Office Mailing Envelopes, 500/Box~#|#~1DFD0707-F05E-4E82-8D4EFAAA70CB311B_sc7
Item: 351470
Model: ST351470N-CC
Price is $37.99
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper 10"" x 13"" Open End Catalog Colored Envelopes with Clasp Closure, Yellow Recycled, 10/Pack (900906710B)~#|#~sp111772287_sc7JAM Paper 10"" x 13"" Open End Catalog Colored Envelopes with Clasp Closure, Yellow Recycled, 10/Pack (900906710B)~#|#~sp111772286_sc7
Item: 38341
Model: 900906710B
Price is $15.89
Unit of measure 10/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
LUX Gummed Security Tinted #10 Business Envelope, 4 1/2" x 9 1/2", White, 50/Pack (45146-50)~#|#~sp14807428_sc7
Item: 24261186
Model: 45146-50
Price is $17.09
Unit of measure 50/Pack
Delivery by Mon, Jul 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper 10" x 13" Open End Catalog Colored Envelopes with Clasp Closure, Orange Recycled, 10/Pack (913745B)~#|#~sp115352063_sc7JAM Paper 10" x 13" Open End Catalog Colored Envelopes with Clasp Closure, Orange Recycled, 10/Pack (913745B)~#|#~sp115352062_sc7
Item: 38340
Model: 913745B
No reviews yet
Price is $15.49
Unit of measure 10/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
TFP ComplyRight Self Seal Security Tinted #10 Business Envelopes, 4 1/2" x 9 1/2", White, 500/Box (1500ES)~#|#~DBADAAFD-19AC-40A2-861E0EF0DD7C4784_sc7TFP ComplyRight Self Seal Security Tinted #10 Business Envelopes, 4 1/2" x 9 1/2", White, 500/Box (1500ES)~#|#~0D4763A0-0A1D-466E-AF1360233E6C9AA2_sc7
Item: 423046
Model: 1500ES
Price is $164.79
Unit of measure 500/Box
Free delivery by Wed, Jul 22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper #9 Booklet Envelopes, 3 7/8" x 8 7/8", White, 50/Pack (4855-WPC-50)~#|#~8F1C6A7A-DE6C-420D-A2B7EE9D92B14F1E_sc7
Item: 24604464
Model: 4855-WPC-50
No reviews yet
Price is $15.95
Unit of measure 50/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper #10 Business Envelope, 4 1/8” x 9 1/2”, White, 250/Box (35532IF)~#|#~sp4800450_sc7JAM Paper #10 Business Envelope, 4 1/8” x 9 1/2”, White, 250/Box (35532IF)~#|#~sp4800449_sc7
Item: 2633054
Model: 35532IF
Price is $26.09
Unit of measure 250/Box
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #10 Premium White Business Envelopes, Gummed Flap Closure, 9.5" x 4.125", 500/Pack~#|#~E65CF8B4-3BE9-446A-BF728FF671907089_sc7Staples #10 Premium White Business Envelopes, Gummed Flap Closure, 9.5" x 4.125", 500/Pack~#|#~F348EB53-3B4F-481F-A4AD4778B99026D6_sc7
Item: 321554
Model: ST19264VP-CC
Price is $27.69
Unit of measure 500/Box Price per unit $0.06/Envelope
Next-Day Delivery by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Ivory, 250/Box (J404I-10)~#|#~s1174993_sc7Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Ivory, 250/Box (J404I-10)~#|#~s1174994_sc7
Item: 581514
Model: J404I-10
Price is $51.59
Unit of measure 250/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #10 Premium Ivory Diagonal‑Seam Gummed Business Envelopes, 4 1/8" x 9 1/2", 500/Box~#|#~517B8DD0-01E3-41A2-BAA178C02B46F29A_sc7Staples #10 Premium Ivory Diagonal‑Seam Gummed Business Envelopes, 4 1/8" x 9 1/2", 500/Box~#|#~F3E31A83-0C8D-4000-AD7AB8B4723E8F6D_sc7
Item: 918211
Model: ST918211-CC
Price is $40.69
Unit of measure 500/Box Price per unit $0.08/Envelope
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM PAPER Commercial Open End Catalog Envelopes, 8 3/4" x 11 1/4", White, 25/Pack (4126)~#|#~sp111772340_sc7JAM PAPER Commercial Open End Catalog Envelopes, 8 3/4" x 11 1/4", White, 25/Pack (4126)~#|#~sp111772339_sc7
Item: 366690
Model: 4126
Price is $14.89
Unit of measure 25/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Cotton #10 Inter-Departmental Envelope 4 1/8" x 9 1/2", Ivory, 50/Pack (R14I-10L)~#|#~73A5B5AE-9689-49DF-A6731CC4CC5A23E0_sc7Southworth Cotton #10 Inter-Departmental Envelope 4 1/8" x 9 1/2", Ivory, 50/Pack (R14I-10L)~#|#~ACCBFA9E-8730-4CB0-A232F9AC4E6819BA_sc7
Item: 619359
Model: R14I-10L
Price is $37.99
Unit of measure 50/Pack
Free Next-Day eligible by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper Plastic Envelopes with Snap Closure, Letter Size, Assorted Colors, 6/Pack (218S0RGBYPCL)~#|#~sp42113868_sc7JAM Paper Plastic Envelopes with Snap Closure, Letter Size, Assorted Colors, 6/Pack (218S0RGBYPCL)~#|#~sp42113867_sc7
Item: 1912826
Model: 218S0RGBYPCL
Price is $21.59
Unit of measure 6/Pack Price per unit $3.60/Envelope
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper Booklet Commercial Envelopes, 6" x 9", White, 50/Pack (4238i)~#|#~sp124925520_sc7JAM Paper Booklet Commercial Envelopes, 6" x 9", White, 50/Pack (4238i)~#|#~sp124925519_sc7
Item: 2633123
Model: 4238I
Price is $13.69
Unit of measure 50/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Quality Park Gummed Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White Wove, 500/Box (QUA24524)~#|#~sp40322449_sc7Quality 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
Price is $99.29
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper #12 Kraft Business Commercial Envelope, 4 3/4" x 11", Manila Brown Kraft, 50/Pack (80762I)~#|#~sp111772471_sc7JAM Paper #12 Kraft Business Commercial Envelope, 4 3/4" x 11", Manila Brown Kraft, 50/Pack (80762I)~#|#~sp111772470_sc7
Item: 1588528
Model: 80762I
Price is $17.09
Unit of measure 50/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper 7.5 x 10.5 Kraft Open End Catalog Envelopes, Brown Kraft Manila, 25/Pack (29215a)~#|#~sp111772455_sc7JAM Paper 7.5 x 10.5 Kraft Open End Catalog Envelopes, Brown Kraft Manila, 25/Pack (29215a)~#|#~sp111772454_sc7
Item: 24052396
Model: 29215A
Price is $9.09
Unit of measure 25/Pack
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Cotton #10 Inter-Departmental Envelope 4 1/8" x 9 1/2", White, 50/Pack (R14-10L)~#|#~s1174945_sc7Southworth Cotton #10 Inter-Departmental Envelope 4 1/8" x 9 1/2", White, 50/Pack (R14-10L)~#|#~s1174943_sc7
Item: 619358
Model: R14-10L
Price is $31.09
Unit of measure 50/Pack
Next-Day Delivery by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", White, 250/Box (J554-10)~#|#~s1174989_sc7Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", White, 250/Box (J554-10)~#|#~s1174988_sc7
Item: 719286
Model: J554-10
Price is $72.09
Unit of measure 250/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Ivory, 250/Box (J564-10)~#|#~s1174985_sc7Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Ivory, 250/Box (J564-10)~#|#~s1174984_sc7
Item: 719294
Model: J564-10
Price is $60.29
Unit of measure 250/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM PAPER #12 Kraft Manila Envelopes, 4 3/4 x 11, Brown Kraft Manila, 100/Pack (27930258)~#|#~sp95009062_sc7JAM PAPER #12 Kraft Manila Envelopes, 4 3/4 x 11, Brown Kraft Manila, 100/Pack (27930258)~#|#~sp95008937_sc7
Item: 24295243
Model: 27930258
Price is $36.49
Unit of measure 100/Pack
Free delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples #12 Brown Kraft Gummed Envelopes, Heavyweight Open‑End Mailing Envelopes, 500/Box~#|#~6EDD007C-0B53-4189-B05AE99C3A78BB5D_sc7Staples #12 Brown Kraft Gummed Envelopes, Heavyweight Open‑End Mailing Envelopes, 500/Box~#|#~C2B671CA-2827-48CC-877449B501662B0C_sc7
Item: 485461
Model: ST50196-CC
Price is $49.49
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", White, 500/Box (35532C)~#|#~sp4800450_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", White, 500/Box (35532C)~#|#~sp4800449_sc7
Item: 2633052
Model: 35532C
Price is $52.29
Unit of measure 500/Box
Free delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Quality Park Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White, 500/Box (QUA24532)~#|#~sp41689013_sc7Quality Park Security Tinted #8 Double Window Envelope 3 5/8" x 8 5/8", White, 500/Box (QUA24532)~#|#~sp41689012_sc7
Item: 864978
Model: QUA24532
Price is $158.99
Unit of measure 500/Box
Free delivery by Fri, Jul 17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
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
Price is $99.29
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Natural, 250/Box (J404N-10)~#|#~s1175033_sc7Southworth Gummed #10 Business Envelopes, 4 1/8" x 9 1/2", Natural, 250/Box (J404N-10)~#|#~s1174991_sc7
Item: 581511
Model: J404N-10
Price is $74.99
Unit of measure 250/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Great Papers! #10 Business Envelope, 4 1/8" x 9 1/2", Ivory, 40/Pack (2013204)~#|#~s0953748_sc7
Item: 1605555
Model: 2013204
Price is $13.09
Unit of measure 40/Pack
Delivery by Mon, Jul 27
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
JAM Paper® Plastic Envelopes with Hook & Loop Closure, Letter Size, Assorted Colors, 6/Pack (218V2OLIPRYS)~#|#~sp150961936_sc7JAM Paper® Plastic Envelopes with Hook & Loop Closure, Letter Size, Assorted Colors, 6/Pack (218V2OLIPRYS)~#|#~sp150961890_sc7
Item: 1912823
Model: 218V2OLIPRYS
Price is $21.69
Unit of measure 6/Pack Price per unit $3.62/Envelope
Delivery by Tue, Jul 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
TFP Self Seal Security Tinted Window Envelope 4-1/2" x 9-1/2", White, 500/Box (1500ES)~#|#~s0403388_sc7
Item: 633519
Model: 1500ES
Price is $88.39
Unit of measure 500/Box
Free Next-Day eligible by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30

Trending now

Page 1 of 4
Putting together a major mailing is an undertaking, to be sure. You have to assemble well-organized papers, ensure you have the right postage, and select the right packaging to fit the documents you have to send. Luckily, selecting the right commercial envelope isn't as hard as you might think, given the many options available these days.

Securing Your Correspondence: Adhesive and Security Tint
Mail supplies may seem like tried-and-true items, but there are a variety of additions that help them function even better. Adding security stripes and tints to commercial window envelopes has allowed sensitive documents to be sent in a way where it is much harder to read what is inside the envelope without opening it. Traditional gummed envelopes still exist, but there are also fast-seal envelopes that don't have to be moistened. You just remove a paper strip to expose the ready adhesive, and your commercial window envelope is ready to go, with a consistent seal every time to maintain the security of your mailing.

Shapes and Sizes for The Mailing You Need
There are many standard sizes of envelopes, each with different mailing classes and rates, so make sure that you pick an envelope that fits a standard size if you'll be sending through the post. Commercial window envelopes must be sent with the right postage for that particular shape and size. An overstuffed envelope can sometimes incur a separate charge and cause issues with post processing.

Use Commercial Window Mailers to Save Money on Labeling
Commercial window envelopes are one of the most helpful ways to save a little money on a mass mailing. Rather than using a label on the outside of the envelope, simply print the address strategically to appear in the window of the envelope when the mailing is folded and placed inside. You'll save time too, since labeling can be time-consuming.