I had to send out a bunch of small envelopes with 1.5" squares. Went to a P.O., and was told it would cost $1.95 each, as they were not flat enought to fit as an envelope. I took them home, opened them, and repostioned the pieces, and taped the envelopes. The cost was $.95 at another P.O... It made a difference as I was sending 12.