OK there's not much that can go wrong with envelopes. They have to be the right size are cut properly (you know those envelopes that warp when you try to close them) they have to hold together when you put something inside and they have to seal properly. Here Staples EasyClose envelopes passed with flying colors... technically flying plain matte white. While I wish they were made of thicker paper I suspect that would just cost more. So price considered I'll give these 5 stars.