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You can't tell from the description, but these envelopes only work when your item is exactly the size of the envelope. Smaller and it only sticks to one side. That's annoying. So purchase carefully because you only get a completely laminated object in this case.
These are to laminate 4" by 6" photographs, and I imagine are great for that purpose. However, I didn't realize they were solely for photographs when I bought them. I wanted to protect some cards, made of paper, which I have to carry with me. They're not really pouches until you seal the two separate sides together. One side has adhesive, the other does not, so you have to center whatever you're sealing in them so that both sides have an edge to stick to the other side.