An A-2 envelope is 4 3/8 x 5 3/4.
An A-6 envelope is 4 3/4 x 6 1/2.
An A-7 envelope is 5 1/4 x 7 1/4.
Remember to undersize anything going into the envelope by 1/4 inch!
You can also find a downloadable Illustrator template of these envelopes on our software downloads.