answer:If you’re concerned about folding or bending put it/them between a couple sheets of cardboard and put them in a tight fitting, probably legal sized, envelope (the big manilla ones). Add extra sheets or cardboard to keep a tight fit so they don’t shift during shipping. You can also send them priority if you want the extra cost, it should mean less handling/travel time, which would hopefully equate to less chance of being bent. The cheaper way would be just put them in the envelope write “DO NOT BEND” in big bold print and hope the post office doesn’t fold it to get it into a small delivery box or through the door slot.