Exactly what you think. Small rectangular mailboxes. They are self-adhesive. They are very lightweight to keep shipping costs low. They got to me very quickly and I use them to ship small garments via USPS. I've been using them for quite some time now and haven't had a single tear or drip which is great. A box of 100 packs is HUGE but by far the best value I have found for smaller polymailers. I recommend them for everyday or business use.
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