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What size return envelope should I use?

Posted: Sat Jul 20, 2013 11:14 am
by Reeny
I bought two different size of envelopes, A5(18.2x24cm) and B6(16.6x20.5cm).
A5 is for request letter.
B6 is for feedback.
Are these size too small?
Should I photos attached with the letter?

Thanks for answering everyone. Btw, my english is not good, sorry. :P