These postal envelopes are very thick and well formed, I've had a few that were very fragile and fell off but they are strong. I only had one order that went wrong in one of those mailboxes and it looked like it was sucked into some sort of postal tape that a customer had sent me. All others have arrived safely. Also, I get a lot of compliments on the cute packaging of these mailers in my reviews! One of my favorite sellers that I definitely buy mailers from. I would highly recommend them and have reordered them many times.
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