The paper of the envelope is a little too thin. I have only used 3 envelopes so far and I already found one that only had a little bit of glue on one side of the flap. These envelopes are ok but not great.
It's accurate but you have to pay attention. The crucial matter is the extra half inch for both the length and width. It makes the envelope just large enough to accommodate the standard 6"x9" offprint or pamphlet.
It's pretty hard to beat the overall quality of the moistenable glue strips on these sassy little lopes. They have that fresh glue taste you just can't argue with and the moistening retention just can't be beat. On top of it that extra 1/2" of space compared to an average letter sack just allows a lot more comfort when sliding in. Staples really outdid themselves. I mean come on this is the kind of quality you can come to expect from a lope with a clasp..