This product saves a LOT of time and hassle when big mailings must go out. As there is adhesive on both the envelope and the flap it is logical that this product would be more expensive but the cost difference is surprisingly more. Everyone needs a luxury or two...
The draw back with the envelopes is that the seal doesn't cover the entire flap leaving the ends open to peel back. Worse yet to be tore by the mail processing machines
Had I seen and touched the paper I never would have bought this item. One thickness heavier than onion skin with self-sealing flaps open (no strip to keep from sticking to anything else) make this a candidate for hand-addressing only. The front end and self-sealing strips get mangled when put through my Brother laser printer - a first for over four years of dependable envelope addressing by that printer! Wouldn't recommend to an enemy.
The envelopes do not stay closed and I need to tape every single one. I am either going to return them or throw them all out. I am very surprised Staples sells this product that is not worth a dime.