I had a CD mailer from another supplier and the cost to mail one with a CD jewel case was 88 cents. This larger envelop and bulkier weight raised the cost per mailing to $1.88. This is simply not acceptable.
Ample size for shipping bulky items with assurance that they will survive the postal system. Self-adhesive flap has excellent adhesion. Best to use a mailing label so as not to puncture the outer paper when writing the delivery address.
I have been sending books to my nephew a freshman in college. The books have arrived in great shape which speaks to how they are protected by the envelopes.