PSBM Rigid Mailers, 13x18 Inch, 100 Pack, Kraft Brown Cardboard Shipping Envelopes for Photo & Document, Self Seal

I have bought these a few times to ship artwork. No complaints from customer's. I add a cardboard insert to ensure the post office can't force the package to bend.They work better than other mailers I've bought.

The self-adhesive strip doesn’t work. After pressing down firmly it just peels back up after sitting for a few minutes. I’m going to have to tape the flaps down & the self-adhesive was the only reason I bought these more expensive envelopes… to save time. Ha!They’re also not as rigid as I would like. They definitely are bendable.