I was very happy with these (bought from barbjewel), and mailed them to dozens of customers. Today though I sealed and then tried to open one. There is no reinforcement on the tab strip, so when you grab on one of the ends to tear, a 1/4" piece just tears off. As a result, getting the mailer open is quite a challenge, without tearing it to pieces or using a cutter. I tried a second one and had the same issue.This doesn't leave a good first impression with my customers.