I can't say enough good things about these mailers. Especially the PRICE. i am a composer My music books are regular size (mostly 8.5" x 11") in a spiral binding. You can hold a thick book or several smaller books. I also always add cardboard so they don't get folded by the post office. While my books always go in clear plastic bags first, I'm glad they're more moisture resistant on the outside. I've been using orange paper bubble mailboxes for years. You will be expensive. When I recently only wanted 25 pieces, I found what I was looking for and bought them because of the price. Now that I have it, I know what a great decision it was.
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