A7 envelopes are 5 ¼” by 7 ¼” (not 5 x 7 envelopes). They are most commonly used for invitations. These invitations are 5 x 7. There is no extra postage for this size of envelope like there can be with square envelopes. Unless the weight of the envelope is too heavy, the postage should be a normal first class stamp. For this stamp your envelope should not weight more than 3 ounces. If you are putting RSVP envelopes inside of these you should know that you can get 2 ounce stamps for them so that you don't have to spend as much on postage.

If you are looking for A7 wedding envelopes that have a pointed flap, these are called baronial envelopes. They are typically used for formal occasions, such as invitations, announcements and greeting cards. Usually they only come in your typical white and cream, but I have seen some colored envelopes.

Baronial Envelopes come in a few different sizes.

• Bar 4: 3 5/8” x 5 1/8”
  
• Bar 5: 4 1/8” x 5 1/2”
  
• Bar 5 1/2: 4 3/8” x 5 3/4” This envelope and the previous 2 envelopes are good for RSVP cards and save the date cards.
  
• Bar 6: 4 3/4” x 6 1/2”
  
• The Lee: 5 1/4” x 7 1/4"

A-Style Envelopes

Whenever you refer to an envelope that does not have a pointed flap, but has a square flap with square corners, these envelopes are called “A-Style”.

• A-2: 4 3/8” x 5 3/4”
  
• A-3: 4 3/5” x 6 1/2”
  
• A-4: 5 1/4” x 7 1/4”
  
• A-5: 5 1/2” x 8 1/8”
  
• A-6: 5 3/4” x 8 3/4”
  
• A-7: 6 x 9 1/2”
  
• Slimline: 3 7/8” x 8 7/8”
  

If you are trying to create some wedding invitations that have inner and outer envelopes, the 5 1/4 x 7 1/4 size of envelope would be the size of the outer envelope. Most paper companies don’t offer the inner envelope size because it is uncommon, 5.125 x 6.875, not to mention you would not want them to be gummed. You should be able to buy just the inner envelopes through a large wedding invitation company. You should order these first so that you can make sure the paper of the outer envelopes matches the inner envelopes. This is a really good idea because the wedding invitation companies tend to charge a lot for the envelopes and you will be able to save some money this way. Of course if you do this your will need to make sure you invitations are just slightly smaller than the inner envelopes which will be smaller that 5 x 7. You cold go to Kinko's and have them chopped just slightly. They have a special cutting machine that should be able to handle this. You could also do this by hand. It might be easier just to buy both inner and outer envelopes from the wedding invitation company.

It is unfortunate that you cannot typically buy the more specialized envelopes as inner and outer envelopes. You cannot as far as I know, buy inner and outer envelopes that have metallic paper or are of different colors. Usually white and cream are the standard. If you are buying envelopes through the wedding invitation company they do offer foil lined envelopes that match for the inner and outer, but sometimes this foil is too shiny and can look cheap. If your invitations are really nice, it is probably better to just skip this option. You should make sure you see a sample before committing to buying what you need.

You can buy these envelopes at your local paper company if you live in a large city, or call the nearest large city to you. Some of them even have big books of wedding invitation samples that you can look through and they will order what you want from these wedding invitation companies. The main big paper distributors are OK Paper, Clampitt Paper and Bosworth Paper. They usually have small retail locations that you can go to. You could also buy the paper online through the paper mill, or other places. This may be good if you do not have a place near you or if the paper companies close to you don't have what you want in stock.

When you create your invitation it is a good idea to cut it and make sure that it fits inside of your envelope. You should always try to assemble your invitation and go through all of the steps before doing mass printing. This will help you not make mistakes, because it is very easy to do.

If you are unhappy with the selection of envelopes available to you, especially when looking at outer and inner envelopes, you can either have some envelopes converted for you, or print onto the envelopes yourself using your inkjet printer. If you do decide to do this you should keep in mind that you cannot crop a design off of the edge of the envelope. If you really wanted to get crazy, you could print what ever design you wanted onto the paper and convert it into an envelope yourself. Make sure to test many different papers if you do this and keep in mind that thicker papers will add to the weight of the invitation. You will want to keep within your limits.

Most envelopes come in a standard thickness, but you may want to keep this in mind. You should look at your invitation inside of the envelope because you don’t want it to show through the envelope too much. Of course unless you get clear envelopes and that is your intention.

If you are looking for more information about wedding invitations online this is a good place to look.