Letter Envelopes

JAM Paper Open End #10 Business Envelope, 4 1/8" x 9 1/2", Red, 50/Pack (67161I)~#|#~sp112110506_sc7JAM Paper Open End #10 Business Envelope, 4 1/8" x 9 1/2", Red, 50/Pack (67161I)~#|#~sp112110505_sc7
Item: 1588624
Model: 67161I
Price is $16.99
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 #10 Window Envelopes, 4 1/8" x 9 1/2", 24 lb. White, Machine Insertable, 250 Qty (28460-MI-250)~#|#~m004064026_sc7
Item: 2146394
Model: 28460-MI-250
No reviews yet
Price is $56.69
Unit of measure 250/Pack
Free delivery by Wed, Jun 10
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 Redi-Strip Self Seal Security Tinted #10 Business Envelope 4 1/8" x 9 1/2", White, 1000/Carton (QUA69122B)
Quality Park Redi-Strip Self Seal Security Tinted #10 Business Envelope 4 1/8" x 9 1/2", White, 1000/Carton (QUA69122B) is New at Staples
Item: QUA69122B
Model: QUA69122B
No reviews yet
Price is $263.50
Unit of measure 1000/Carton
Free delivery by Tue, Jun 02
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", Yellow, 25/Pack (15859)~#|#~sp111772364_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Yellow, 25/Pack (15859)~#|#~sp111772363_sc7
Item: 260986
Model: 15859
Price is $10.29
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Envelopes, 4.125 x 9.5, Dark Red, 25/Pack (31511298)~#|#~m005744846_sc7JAM Paper #10 Business Envelopes, 4.125 x 9.5, Dark Red, 25/Pack (31511298)~#|#~m000067704_sc7
Item: 261408
Model: 31511298
No reviews yet
Price is $18.49
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Policy Business Envelopes, 4 1/8" x 9 1/2", Baby Blue, 25/Pack (3961300)~#|#~m003904856_sc7JAM Paper #10 Policy Business Envelopes, 4 1/8" x 9 1/2", Baby Blue, 25/Pack (3961300)~#|#~m003904855_sc7
Item: 261366
Model: 3961300
Price is $14.89
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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", Navy Blue, 25/Pack (LEBA367)~#|#~m003905150_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Navy Blue, 25/Pack (LEBA367)~#|#~m003905149_sc7
Item: 261705
Model: LEBA367
Price is $19.49
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 #10 Square Flap Envelopes (4 1/8 x 9 1/2) 50/Pack, Baby Blue (EX4860-13-50)~#|#~sp14807369_sc7
Item: 24260916
Model: EX4860-13-50
No reviews yet
Price is $25.19
Unit of measure 50/Pack
Delivery by Wed, Jun 10
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 Open End #10 Business Envelope, 4 1/8" x 9 1/2", Violet Purple, 50/Pack (15864I)~#|#~sp112110499_sc7JAM Paper Open End #10 Business Envelope, 4 1/8" x 9 1/2", Violet Purple, 50/Pack (15864I)~#|#~sp112110498_sc7
Item: 1590445
Model: 15864I
Price is $20.49
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 Strathmore #10 Business Envelope, 4 1/8" x 9 1/2", Bright White, 25/Pack (18506)~#|#~m007063336_sc7JAM Paper Strathmore #10 Business Envelope, 4 1/8" x 9 1/2", Bright White, 25/Pack (18506)~#|#~m007063335_sc7
Item: 263980
Model: 18506
Price is $20.49
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Policy Business Strathmore Envelopes, 4.125 x 9.5, Natural White Wove, 25/Pack (191249)~#|#~m007063366_sc7JAM Paper #10 Policy Business Strathmore Envelopes, 4.125 x 9.5, Natural White Wove, 25/Pack (191249)~#|#~m007049471_sc7
Item: 262548
Model: 191249
Price is $14.89
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 V-Flap Security Tinted Business #10 Envelopes, 4 1/8" x 9 1/2", White, 500/Bx (QUA90030)~#|#~s0462616_sc7
Item: QUA90030
Model: QUA90030
No reviews yet
Price is $48.69
Unit of measure 500/Box
Free delivery by Wed, Jun 03
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", Baby Blue, 25/Pack (2155778)~#|#~sp121511889_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Baby Blue, 25/Pack (2155778)~#|#~sp121511888_sc7
Item: 261365
Model: 2155778
Price is $19.49
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 #10 Regular Envelopes (4 1/8 x 9 1/2) 50/Box, 24lb. White w/ FDIC Security Tint (WS-2652-50)~#|#~m004064021_sc7
Item: 2147235
Model: WS-2652-50
Price is $14.29
Unit of measure 50/Pack
Delivery by Wed, Jun 10
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 80lb 4 1/8"x9 1/2" Open End #10 Envelopes W/Peel&Press, Natural, 250/BX~#|#~m000211241_sc7
Item: 515118
Model: 7716-NPC-250
No reviews yet
Price is $91.49
Free delivery by Wed, Jun 10
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 Strathmore Open End #10 Business Envelope, 4 1/8" x 9 1/2", Bright White, 50/Pack (18506I)~#|#~m007063336_sc7JAM Paper Strathmore Open End #10 Business Envelope, 4 1/8" x 9 1/2", Bright White, 50/Pack (18506I)~#|#~m007063335_sc7
Item: 1588781
Model: 18506I
Price is $20.49
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 #10 Regular Envelopes (4 1/8 x 9 1/2) 500/Pack, Sunflower (LUX-4260-12-500)~#|#~sp12274947_sc7LUX #10 Regular Envelopes (4 1/8 x 9 1/2) 500/Pack, Sunflower (LUX-4260-12-500)~#|#~sp12275007_sc7
Item: 24162059
Model: LUX-4260-12-500
No reviews yet
Price is $98.79
Unit of measure 500/Pack
Free delivery by Wed, Jun 10
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", Natural, 25/Pack (900926651)~#|#~sp134498373_sc7JAM Paper #10 Business Envelope, 4 1/8" x 9 1/2", Natural, 25/Pack (900926651)~#|#~sp134498372_sc7
Item: 261878
Model: 900926651
Price is $20.49
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Self Seal Policy Envelopes, 4 1/8" x 9 1/2", Strathmore White, 50/Pack (7716-WLI-50)~#|#~6E821E8F-5177-4680-BAA135A9177556E2_sc7JAM Paper #10 Self Seal Policy Envelopes, 4 1/8" x 9 1/2", Strathmore White, 50/Pack (7716-WLI-50)~#|#~E455C262-24B6-42A8-BC866CFE5F843B19_sc7
Item: 24604525
Model: 7716-WLI-50
No reviews yet
Price is $13.95
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes W/Glue Closure, Amethyst Metallic Purple~#|#~m004940421_sc7LUX 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes W/Glue Closure, Amethyst Metallic Purple~#|#~m005823899_sc7
Item: 281913
Model: 5360-17-50
Price is $20.39
Unit of measure 50/Pack
Delivery by Wed, Jun 10
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 Self Seal Business Envelope, 4 1/8 x 9 1/2, Cotton Gray, 50 Pack (4860-SG-50)~#|#~sp226423802_sc7JAM Paper Self Seal Business Envelope, 4 1/8 x 9 1/2, Cotton Gray, 50 Pack (4860-SG-50)~#|#~sp226423801_sc7
Item: 24578396
Model: 4860-SG-50
No reviews yet
Price is $26.19
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 Peel & Seal #10 Kraft Business Envelope, 4 1/8" x 9 1/2", Christmas Red, 25/Pack (11789)~#|#~sp36388124_sc7JAM Paper Peel & Seal #10 Kraft Business Envelope, 4 1/8" x 9 1/2", Christmas Red, 25/Pack (11789)~#|#~sp36388044_sc7
Item: 263862
Model: 11789
Price is $10.29
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Peel & Seal #10 Business Envelope, 4 1/8" x 9 1/2", Christmas Green, 25/Pack (86555)~#|#~6D72CF40-FFBC-49D2-943889305B5B19A6_sc7
Item: 261275
Model: 86555
Price is $10.29
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes W/Glue Closure, Gold Metallic~#|#~m004940416_sc7LUX 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes W/Glue Closure, Gold Metallic~#|#~m005823910_sc7
Item: 281925
Model: 5360-07-50
Price is $42.99
Unit of measure 50/Pack
Free delivery by Wed, Jun 10
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 80lb 4 1/8"x9 1/2" Open End #10 Envelopes W/Peel&Press, White Linen, 250/BX~#|#~m000211243_sc7
Item: 515097
Model: 7716-WLI-250
No reviews yet
Price is $109.09
Free delivery by Wed, Jun 10
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 Self Seal #10 Business Envelopes, 4 1/8" x 9 1/2", White, 50/Pack (43687-50)~#|#~sp228873472_sc7JAM Paper Self Seal #10 Business Envelopes, 4 1/8" x 9 1/2", White, 50/Pack (43687-50)~#|#~sp228873471_sc7
Item: 24578331
Model: 43687-50
No reviews yet
Price is $31.69
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 Gummed #10 Business Envelope, 4 1/8" x 9 1/2", Green Brite Hue, 50/Pack (15862I)~#|#~sp151516563_sc7JAM Paper Gummed #10 Business Envelope, 4 1/8" x 9 1/2", Green Brite Hue, 50/Pack (15862I)~#|#~sp151516562_sc7
Item: 1588699
Model: 15862I
Price is $16.99
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 Policy Business Envelopes, 4 1/8" x 9 1/2", Presidential Blue, 25/Pack (263912999)~#|#~sp137085032_sc7
Item: 261135
Model: 263912999
Price is $14.89
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 #10 Square Flap Envelopes (4 1/8 x 9 1/2) 50/Pack, Midnight Black (F-4560-B-50)~#|#~sp14807461_sc7
Item: 24260629
Model: F-4560-B-50
Price is $12.69
Unit of measure 50/Pack
Delivery by Wed, Jun 10
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 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes, Crystal Metallic, 50/Pack~#|#~m004940428_sc7LUX 4 1/8" x 9 1/2" #10 80lbs. Square Flap Envelopes, Crystal Metallic, 50/Pack~#|#~m005823906_sc7
Item: 281920
Model: 5360-30-50
No reviews yet
Price is $40.09
Unit of measure 50/Pack
Free delivery by Wed, Jun 10
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 #10 Regular Envelopes (4 1/8 x 9 1/2) 50/Pack, Sunflower (LUX-4260-12-50)~#|#~sp12274947_sc7LUX #10 Regular Envelopes (4 1/8 x 9 1/2) 50/Pack, Sunflower (LUX-4260-12-50)~#|#~sp12275007_sc7
Item: 24162051
Model: LUX-4260-12-50
Price is $39.09
Unit of measure 50/Pack
Free delivery by Wed, Jun 10
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 #10 Regular Envelopes (4 1/8 x 9 1/2) 250/Pack, Electric Cherry (WS-2995-250)~#|#~sp5822112_sc7LUX #10 Regular Envelopes (4 1/8 x 9 1/2) 250/Pack, Electric Cherry (WS-2995-250)~#|#~sp5873624_sc7
Item: 23996109
Model: WS-2995-250
No reviews yet
Price is $44.89
Unit of measure 250/Pack
Free delivery by Wed, Jun 10
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 80lbs. 4 1/8" x 9 1/2" #10 Square Flap Envelopes, Navy Blue, 250/BX~#|#~m000161287_sc7
Item: 388493
Model: LUX-4860-103-25
No reviews yet
Price is $58.49
Unit of measure 250/Box
Free delivery by Wed, Jun 10
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 Open End #10 Business Envelope, 4 1/8" x 9 1/2", Yellow, 50/Pack (15859I)~#|#~sp111772364_sc7JAM Paper Open End #10 Business Envelope, 4 1/8" x 9 1/2", Yellow, 50/Pack (15859I)~#|#~sp111772363_sc7
Item: 1588621
Model: 15859I
Price is $17.09
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 #10 Square Flap Envelopes (4 1/8 x 9 1/2) 50/Pack, 70lb. Bright White (4860-70W-50)~#|#~sp14807393_sc7
Item: 24260394
Model: 4860-70W-50
No reviews yet
Price is $16.49
Unit of measure 50/Pack
Delivery by Wed, Jun 10
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 #10 Window Envelopes, 4 1/8" x 9 1/2", 24 lb. White, Machine Insertable, 1000 Qty (28460-MI-1M)~#|#~m004064026_sc7
Item: 2146382
Model: 28460-MI-1M
No reviews yet
Price is $86.99
Unit of measure 1000/Pack
Free delivery by Wed, Jun 10
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 Self Seal Policy Envelope 4 1/8" x 9 1/2", Natural Linen, 50/Pack (7716-NLI-50)~#|#~FC7B9E63-6939-4320-9110C68A66F9926D_sc7JAM Paper Self Seal Policy Envelope 4 1/8" x 9 1/2", Natural Linen, 50/Pack (7716-NLI-50)~#|#~5EA03894-4924-41B6-A88F8C44718A3AC0_sc7
Item: 24604592
Model: 7716-NLI-50
No reviews yet
Price is $13.95
Unit of measure 50/Pack
Delivery by Mon, Jun 08
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 Strathmore #10 Business Envelope, 4 1/8" x 9 1/2", Bright White Wove, 25/Pack (64933)~#|#~sp112110502_sc7JAM Paper Strathmore #10 Business Envelope, 4 1/8" x 9 1/2", Bright White Wove, 25/Pack (64933)~#|#~sp112110501_sc7
Item: 262529
Model: 64933
Price is $19.69
Unit of measure 25/Pack
Delivery by Mon, Jun 08
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 Strathmore Open End #10 Business Envelope, 4 1/8" x 9 1/2", Natural White Wove, 50/Pack (34992I)~#|#~m007159127_sc7JAM Paper Strathmore Open End #10 Business Envelope, 4 1/8" x 9 1/2", Natural White Wove, 50/Pack (34992I)~#|#~m007159126_sc7
JAM Paper Strathmore Open End #10 Business Envelope, 4 1/8" x 9 1/2", Natural White Wove, 50/Pack (34992I) is Out of stock
Item: 1588542
Model: 34992I
No reviews yet
Price is $20.49
Unit of measure 50/Pack
Quality Park Redi-Strip Self Seal Security Tinted #10 Business Envelope 4 1/8" x 9 1/2", White, 1000/Carton (QUA69122B)~#|#~sp108671159_sc7
Quality Park Redi-Strip Self Seal Security Tinted #10 Business Envelope 4 1/8" x 9 1/2", White, 1000/Carton (QUA69122B) is Out of stock
Item: 2623287
Model: QUA69122B
No reviews yet
Price is $165.49
Unit of measure 1000/Carton

Letter envelopes are an essential office supply for any home or office. These standard, versatile envelopes can be used to mail letters, checks, documents and more. At Staples, you can buy letter size envelopes in bulk in packs of anywhere from 25 to 2,500. Learn about the different types of letter envelopes below.

What Are Letter Envelopes?

A letter envelope is a sealable paper envelope typically measuring 4 ⅛ inches by 9 ½ inches, also known as a #10 envelope. Letter envelopes are not meant to contain thick or heavy objects. Rather, they’re meant to hold paper and other thin, light and flat materials. A letter-size envelope is also often compatible with a printer for those who want to print addresses rather than write them by hand. These #10 envelopes are the perfect size for mailing letters or documents because they are not too small to be accepted by postal services and not too big to require extra postage.

Types of Letter Envelopes

Letter envelopes also come in several different styles, the most common of which are described below.

  • Environmentally Friendly Envelopes - These are made from recycled paper and are great for households or businesses that do a lot of mailing to reduce environmental impact.
  • Business Envelopes - These envelopes include a clear plastic window for parts of the documents inside to be made visible. These windows have securely gummed closures to ensure that the contents of the envelope stay protected.
  • Multi-Colored Envelopes - Letter envelopes come in a variety of color options, including beige, pink, yellow, green, purple and more.
  • V-Flap Envelopes - The standard letter envelope is designed with a rectangular adhesive flap, but triangular, or “v-flap,” adhesive flaps are also available and are commonly used with greeting cards and invitations.
  • Linen Envelopes - Some letter envelopes come with a linen finish to set your letter apart and add an elegant touch.

How Do I Mail a Letter Envelope?

Here are the steps needed to mail a classic #10 letter envelope:

  1. On the side without the seal, write or print the recipient's address in the middle with a legible pen (pencil marks can dull or rub off in transit). Write the sender’s address in the envelope’s top left corner.
  2. In the top right corner, you will need to place adequate postage for the envelope to reach its destination.
  3. With the material you want to send inside the envelope, seal it by adding a light amount of moisture to the adhesive flap. If you don’t prefer to use your tongue, you can use a moist sponge or cotton swab to do this. Alternatively, you can even use tape or glue sticks to seal envelopes. Some letter envelope varieties are self-seal or peel-and-seal and are able to seal on their own without needing added moisture.
  4. Place the envelope in a USPS mailbox or bring it to a post office.