I run an online business selling CDs and DVDs, mostly to international customers, and I have ordered these from greatofferstock.com for years, they are PERFECT for my needs (folding these in half is IDEAL for shipping the types of product I sell because it doubles the amount of bubble lining between the product and the hostile postal environment!). I get so many compliments about the quality of my packing and shipping methods, and these are the heart of it! Great adhesion on the flap to prevent mail tampering, and heat sealed on the remaining three edges to prevent unwanted and unexpected "opening" during handling. I highly recommend these mailers! Great quality at an even greater price!