The envelopes are fine I bought them because I didn't want to have to lick closed a bunch of envelopes but the self stick function doesn't work the stickiness isn't effective so I had to tape down all of the envelopes before mailing. I would suggest getting the dampen to close ones or getting tape and taping them shut.
The construction of the envelopes themselves are of good quality. They do not tear or rip easily and feel sturdy and secure. However the "Easy Close" aspect leaves something to be desired....like closure. It sticks for approx 5 min. If you are using these envelopes to mail something use tape over the seam. If you are using these envelopes to hand deliver something use tape over the seam. Bottom line=put tape over the seam to actually secure the seal.