Envelope Size... need help!

Ok, so since i'm dumb, I need your help lol.

I'm going to order envelopes for the STDs/Hotel Info postacrds.

The both measure 5.59' x 4.33'.

They have the A9 envelope that measures:

4 3/4 x 6 1/2

that's what I need right? is that too big or just the right size?

That seems pretty close.

If they don't have a smaller/closer size, go with it! It's not going to be snug, but it won't be overly big either I think?

I think your envelope width is too big, i mean it fits, but it's an inch bigger than the invite.

if we round off your invite size, they are 5.625 x 4.375. Typically, the envelope is about 1/8 of an inch bigger (.125') than the insert,. You can go about 1/2' bigger but anymore than that gets too big.

This is the site i use for reference all the time (im a designer):
http://www.belightsoft.com/products/companion/paper/envelopes.php

I think you need something about 5.75 x 4.5.

Hope this helps!! Looking for envelopes is always tough!