I have purchased these envelopes from Staples before and like the fact that the quality of the envelope is sturdy. I have purchased other brands and find them too flimsy.
Purchased these for a direct mail marketing campaign. So far they have worked well. The security tint prevented seeing the content of a two sided letter. I just mailed the first batch of 25 yesterday. Other reviewers stated the envelope didn't seal properly and were ripped when going through the USPS automation equipment. It is too early to tell if that happened to my first batch. For added protection I dabbed a glue stick on the corners of the flap to seal them tight. The self adhesive worked fine when closing the flap. I am happy with the purchase.
Adequate for the job. But not as good as the Mead envelopes they are replacing. The paper is thinner the privacy tint is noticeably weaker and the adhesive is not quite as sticky. They'll do but I would have been willing to pay more for better quality.