The #10 Airmail Envelopes would be suitable for sending important documents, like critical paperwork, via US mail.
JAM PAPER #10 Airmail Envelopes - 4 1/8 x 9 1/2 - White - 50/Pack
#10 Airmail Envelopes - 4 1/8 X 9 1/2 - White - 50/Pack
JAM PAPER #10 Business Commercial Envelopes - 4 1/8 x 9 1/2 - #10, 50 Pack
#11 Envelopes - 4 1/2 x 10 3/8 - Brown Kraft Manila - 50/Pack
JAM PAPER #11 Envelopes - 4 1/2 X 10 3/8 - Brown Kraft Manila - 50/Pack
