120 PCS #10 Golden Self Seal Kraft 4-1/8 x 9-1/2 inches Security Envelopes, Windowless Invisible Envelopes Super Strong Quick Seal Envelopes Security Tint Pattern Secure

I sell common sports cards and similarly sized paper memorabilia. I mail them using USPS First Class regular mail. I purchased these envelopes in the hope that they would protect the contents from damage when being sent through the postal service's optical scanner/sorter. Regular #10 envelopes seemed to be too thin to protect the contents without adding additional reinforcement. These envelopes are perfect for my needs. Every mailing, even with multiple cards in the envelope have arrived safely, a testament to the strength and thickness of this product. An additional benefit is that the contents are protected from identifying them, a benefit if checks are sent. My only minor "complaint" is that about 1 in 5 of the tapes you pull to expose the adhesive tape tends to stick and not release easily. Not a problem, just pull the tape strip from the opposite side of the envelope, that fixes the issue.

Nice, heavyweight envelopes in sexy, mysterious black. Used to send invitations to a Murder mystery party.

This product is of great quality, professional standards, and overall great quality. Will purchase again.

plenty sturdy to ship vinyl decals without worrying that they'll get bentAnd the adhesive strip is absurdly stickyZero complaints!

I love the fact you can't see through them at all. The self adhesive work beautifully. No more licking envelopes! These are perfect to use as security envelopes. There even better than those white security envelopes. They shipped mine next day just like promised.

Superior quality paper. Does not have security Tint. 10/10 Difficulty Flap removal

Good for mailing thicker items

Work good