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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 Walnut Euro Flap Envelopes, Gmund Colors Matt 68lb
23 More Colors >
 
Walnut Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.77per 25 Pack
SALE
53% OFF
A1 Chartreuse Straight Flap Envelopes, Gmund Colors Matt 68lb
1 More Colors >
 
A1 Chartreuse Straight Flap Envelopes, Gmund Colors Matt 68lb
$3.09per 25 Pack
SALE
76% OFF
A1 Tangy Orange Straight Flap Envelopes, Poptone 70lb
 
A1 Tangy Orange Straight Flap Envelopes, Poptone 70lb
$1.85per 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
$2.89per 25 Pack
SALE
40% OFF
A1 Max White Cotton Old World Flap Envelopes, Gmund Cotton 74lb
 
A1 Max White Cotton Old World Flap Envelopes, Gmund Cotton 74lb
$4.77per 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
$6.77per 25 Pack
A1 Timberwolf Gray Euro Flap Envelopes, Gmund Colors Matt 81lb
8 More Colors >
 
Timberwolf Gray Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.77per 25 Pack
A1 Opal Metallic Euro Flap Envelopes, Stardream 81lb
 
Opal Stardream Envelopes 3 5/8 x 5 1/8 - Euro Flap - Metallic
$5.20per 25 Pack
Radiant White Euro 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 - Euro Flap - Smooth
$6.15per 25 Pack
A1 Wedding Cream Euro Flap Envelopes, Gmund Colors Matt 91lb
 
Wedding Cream Gmund Colors MATT Envelopes 3 5/8 x 5 1/8 - Euro Flap - Matte
$6.77per 25 Pack
A1 Wedding White Cotton Euro Flap Envelopes, Gmund Cotton 74lb
 
Wedding White 100% Cotton Envelopes 3 5/8 x 5 1/8 - Euro Flap - Cotton
$8.18per 25 Pack
A1 Jupiter Metallic Straight Flap Envelopes, Stardream 81lb
11 More Colors >
 
Jupiter Stardream Envelopes 3 5/8 x 5 1/8 - Straight Flap - Metallic
$5.20per 25 Pack
A1 Red Lacquer Metallic Straight Flap Envelopes, Curious Metallics 80lb
5 More Colors >
 
Red Lacquer Curious Metallics Envelopes 3 5/8 x 5 1/8 - Straight Flap - Metallic
$6.38per 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
$9.52per 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
$5.53per 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
$6.50per 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
$5.53per 25 Pack
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
$253.67per 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
$55.70per 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
$190.82per 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
$173.68per 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
$281.31per 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
$258.55per 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
$312.84per 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
$362.18per 2000 Pack
A1 Natural Straight Flap Envelopes, Astroparche 60lb
2 More Colors >
 
Natural Astroparche Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$180.09per 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
$271.63per 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
$161.44per 2500 Pack
A1 Blast-Off Blue Pointed Flap Envelopes, Astrobright 60lb
18 More Colors >
 
Blast-Off Blue Astrobright Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$254.08per 2500 Pack
A1 Cosmic Orange Pointed Flap Envelopes, Astrobright 70lb
 
Cosmic Orange Astrobright Envelopes 3 5/8 x 5 1/8 - Pointed Flap - Matte
$264.81per 2500 Pack
A1 Terra Green Straight Flap Envelopes, Astrobright 70lb
 
Terra Green Astrobright Envelopes 3 5/8 x 5 1/8 - Straight Flap - Matte
$179.88per 2500 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