We have to mail property owners large keys to our security gate. Experience has taught us that these keys cut through most mailing envelopes. They don't cut through this envelope!
The most difficult time I had with this product was that it was a little too thin. I mail a lot of items using this product and it is sometimes difficult to get the items into the mailer. It needs in my opinion a little more thickness and I wouldn't mind paying just a little more for that fox. The paper is a little thinner than I would like but it is adequate and I have had no complaints from customers that the package was damaged upon arrival. The last item is that there is that it could use a little more stick-um on the flap.
I use these primarily for shipping small packages of birthday cookies to friends all over the US. The envelope is lightweight which keeps shipping costs down and there is enough padding that just a few packing peanuts will keep a small container of cookies from arriving as crumbs. It is the perfect size for the plastic containers. The only way you could make this product better is to reduce the price. The quality is excellent at the current price but hey it can't hurt to ask can it?