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A1 Envelopes

 

Small 3 5/8 x 5 1/8 (A1) envelopes are the most popular response card envelope size, and are also great for thank you cards, note cards, and simple save the dates. A1 envelopes are offered in a rainbow of colors & flap styles, close to 100 colors to choose from. Mix and match with 3 1/2 x 4 7/8 A1 blank cards for the perfect note or RSVP card and envelope set.

Did you know that the A1 envelope is the smallest mailable envelope size in the USA?

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A1 Solar White Linen - Straight Flap Envelopes, Classic Linen (80lb)
 
Solar White Classic Linen Envelopes 3 5/8 x 5 1/8 - Straight Flap - Linen
$248.60per 2500
A1 Lemon Drop - Euro Flap Envelopes, Poptone (70lb)
17 More Colors >
 
Lemon Drop Poptone Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$54.59per 250 Pack
A1 White Felt - Straight Flap Envelopes, Royal Sundance (80lb)
 
White Royal Sundance Envelopes 3 5/8 x 5 1/8 - Straight Flap - Felt
$187.00per 2500 Pack
A1 White Felt - Straight Flap Envelopes, Royal Sundance (70lb)
 
White Royal Sundance Envelopes 3 5/8 x 5 1/8 - Straight Flap - Felt
$170.21per 2500 Pack
A1 White Felt - Pointed Flap Envelopes, Royal Sundance (80lb)
 
White Royal Sundance Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Felt
$275.68per 2500 Pack
A1 White Felt - Pointed Flap Envelopes, Royal Sundance (70lb)
 
White Royal Sundance Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Felt
$253.38per 2500 Pack
A1 Black Smooth Tactile - Straight Flap Envelopes, Plike (95lb)
 
Black Plike Envelopes 3 5/8 x 5 1/8 - Straight Flap - Smooth Tactile
$306.58per 2000 Pack
A1 White Smooth Tactile - Pointed Flap Envelopes, Plike (95lb)
 
White Plike Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Smooth Tactile
$354.94per 2000 Pack
A1 White - Straight Flap Envelopes, Astroparche (60lb)
2 More Colors >
 
White Astroparche Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$176.49per 2500 Pack
A1 White - Pointed Flap Envelopes, Astroparche (60lb)
2 More Colors >
 
White Astroparche Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$266.20per 2500 Pack
A1 Vulcan Green - Straight Flap Envelopes, Astrobright (60lb)
18 More Colors >
 
Vulcan Green Astrobright Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$158.21per 2500 Pack
A1 Terra Green - Straight Flap Envelopes, Astrobright (70lb)
 
Terra Green Astrobright Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$176.28per 2500 Pack
A1 Solar Yellow - Straight Flap Envelopes, Astrobright (80lb)
 
Solar Yellow Astrobright Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$192.04per 2500 Pack
A1 Vulcan Green - Pointed Flap Envelopes, Astrobright (60lb)
18 More Colors >
 
Vulcan Green Astrobright Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$249.00per 2500 Pack
A1 Terra Green - Pointed Flap Envelopes, Astrobright (70lb)
 
Terra Green Astrobright Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$259.51per 2500 Pack
A1 Solar Yellow - Pointed Flap Envelopes, Astrobright (80lb)
 
Solar Yellow Astrobright Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$280.52per 2500 Pack
SALE
76% OFF
A1 Tangy Orange - Straight Flap Envelopes, Poptone (70lb)
 
A1 Tangy Orange - Straight Flap Envelopes, Poptone (70lb)
$1.81per 25 Pack
SALE
64% OFF
A1 Ionised Metallic - Old World Flap Envelopes, Curious Metallics (80lb)
 
A1 Ionised Metallic - Old World Flap Envelopes, Curious Metallics (80lb)
$2.83per 25 Pack
SALE
53% OFF
A1 Scarlet Red - Straight Flap Envelopes, Gmund Colors Matt (68lb)
1 More Colors >
 
A1 Scarlet Red - Straight Flap Envelopes, Gmund Colors Matt (68lb)
$3.03per 25 Pack
SALE
23% OFF
A1 Max White Cotton - Old World Flap Envelopes, Gmund Cotton (74lb)
 
A1 Max White Cotton - Old World Flap Envelopes, Gmund Cotton (74lb)
$6.03per 25 Pack
A1 Botanic Metallic - Straight Flap Envelopes, Curious Metallics (80lb)
4 More Colors >
 
Botanic Curious Metallics Envelopes 3 5/8 x 5 1/8 - Straight Flap - Metallic
$6.25per 25 Pack
A1 Tindalo Wood Grain - Straight Flap Envelopes, Gmund Wood (68lb)
 
Tindalo Wood Grain Envelopes 3 5/8 x 5 1/8 - Straight Flap - Wood Grain
$9.33per 25 Pack
A1 Bronze Metallic - Straight Flap Envelopes, Stardream (81lb)
11 More Colors >
 
Bronze Stardream Envelopes 3 5/8 x 5 1/8 - Straight Flap - Metallic
$5.10per 25 Pack
A1 Sepia - Euro Flap Envelopes, Gmund Colors Matt (68lb)
23 More Colors >
 
Sepia Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.63per 25 Pack
A1 Limba - Euro Flap Envelopes, Gmund Colors Matt (91lb)
 
Limba Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.63per 25 Pack
A1 Sea Grass - Euro Flap Envelopes, Gmund Colors Matt (81lb)
8 More Colors >
 
Sea Grass Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.63per 25 Pack
Ecru Euro Flap Envelopes, A1 ( 3 5/8 x 5 1/8), LCI Smooth 70lb
 
Ecru LCI Smooth Envelopes 3 5/8 x 5 1/8 - Euro Flap - Smooth
$6.03per 25 Pack
Radiant White Pointed Flap Envelopes, A1 ( 3 5/8 x 5 1/8), LCI Smooth 70lb
 
Radiant White LCI Smooth Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Smooth
$5.42per 25 Pack
A1 Natural White Linen - Straight Flap Envelopes, LCI (70lb)
 
Natural White LCI Linen Envelopes 3 5/8 x 5 1/8 - Straight Flap - Linen
$6.37per 25 Pack
Radiant White Straight Flap Envelopes, A1 ( 3 5/8 x 5 1/8), LCI Smooth 70lb
 
Radiant White LCI Smooth Envelopes 3 5/8 x 5 1/8 - Straight Flap - Smooth
$5.42per 25 Pack
A1 No Bleach - Euro Flap Envelopes, No Color No Bleach (81lb)
 
No Bleach No Color No Bleach Envelopes 3 5/8 x 5 1/8 - Euro Flap - Organic
$6.63per 25 Pack
A1 Crystal Metallic - Euro Flap Envelopes, Stardream (81lb)
 
Crystal Stardream Envelopes 3 5/8 x 5 1/8 - Euro Flap - Metallic
$5.10per 25 Pack
A1 Max White Cotton - Euro Flap Envelopes, Gmund Cotton (74lb)
 
Max White 100% Cotton Envelopes 3 5/8 x 5 1/8 - Euro Flap - Cotton
$8.79per 25 Pack
 

A1 Envelopes (FAQs)

Is this envelope suitable for use as a wedding RSVP envelope?

Yes, A1 3 5/8 x 5 1/8 envelope size is a common, standard RSVP envelope size. To match your custom invites, we offer hundreds of A1 response envelopes in colors, finishes, and textures galore, all blank or printed with your return address.

Learn more about LCI Paper's envelope printing service.

A1 envelopes a bit too small for your taste? A2 envelopes are the second most popular response envelope size.

Can little A1 envelopes be mailed in the United States?

Yes, though they are small, A1 envelopes can be mailed through the United States Postal Service.

Do A1 3 5/8 x 5 1/8 envelopes require normal postage?

A1 envelopes require standard postage so long as they weigh 1 ounce or under.

What is the difference between 4-bar and A1 envelopes?

Pertaining to size, nothing! The terms 4-bar and A1 envelopes both refer to envelopes measuring 3 5/8 x 5 1/8 inches - the standard, popular R.S.V.P. envelope size. In technical paper jargon terms, bar comes from baronial - a style of announcement envelope with a traditional pointed flap - but in average joe, envelope size terms, A1 and 4-bar are synonymous.

These envelopes are also commonly referred to as A-1 envelopes, and 3x5 envelopes.

I need wedding reply envelope etiquette help! How do I properly address my envelopes to include both my fiance and myself?

First and foremost, the actual mailing address is the most important piece of a RSVP return address, so be sure that the address is correct and recognizable to your local post office.

Regarding the names, there are many common ways of doing this - take your pick!

  • Jane Doe and John Smith
  • J. Doe & J. Smith
  • The Future Mr. and Mrs. Smith
  • The Future Mr. and Mrs.
  • J & J (in a decorative monogram)
  • ...and with your creativity, the list goes on