Quality ParkSurvivor Lightweight 14 lb Tyvek Open End 1.5" Expansion Mailers, 13 1/2, Square Flap, Redi-Strip Closure, 10 x 13, White, 25/Box

These have gusseted sides for expansion and are heavy duty and light weight, they fit in my file cabinet folder without sticking up, because they have give.

We use these every day at work. They are sturdy and durable. We have ordered these before and will continue to order these for the office. It's a good saving on the value.

The Survivor brand of Tyvek envelopes has been a sturdy, water-resistant option for mailing important documents.

Though these would be durable and will probably outlast humanity itself they're not very sturdy.

Great price!I have used Quality Park envelopes for years. Never use anything else. They are so durable, even if I ship books. They are very strong!!!

Used these for storage for many years, love them. Won’t rip

Great product!

These are nice tear proof mailing envelopes at a decent price. Much stronger than manila. i will order these again.

Muy resistente y bien diseñado , lo recomiendo ampliamente

Buenos, mas no se puede imprimir bien sobre ellos, no dura demasiado la tinta sobre los mismos.