Sooo -- why don't you cram the fabrics in a flat rate box???
A small flat rate box costs $5.20 to mail
A med. flat rate box costs $10.95 to mail
A large flat rate box costs $14.95 to mail
I just sent a 87x87 quilted quilt with 2 magazines and extra fabric for $14.95
Seems to me you all have trouble with the envelopes and it is just as easy to send the stuff in a box.