Can not notice any difference between Staples brand & Mead envelopes. For the price you can't beat it. As well as for the quantity that you get per box it is a great value.
When you want a strong serviceable envelope in the regular business size (#10) you can't go wrong with Staples' EasyClose Security-Tint Envelopes. I keep monthly bills in these envelopes I mail checks in these envelopes I send friends articles and notes in these envelopes and need them for all sorts of random tasks around the house. When I want to seal them up the pull-off strip makes that job free of the licking function that can turn your tongue into a dry mop. I can rely on this envelope to hold whatever I put in it and survive the postal service lumps and bumps to arrive at its destination.
I love these security tinted envelopes. I own a small business (about 7 employees) and I used these envelopes to distribute paycehecks. They're secure and convenient to close.