Love that you do not have lick these. But you better make sure you have everything in there before you close because there is no undoing it. They stick great
I had a box of old envelopes for so long that the gummed seal sealed itself from just the humidity in the room! I don't need envelopes that often except for the rare vendor who doesn't accept electronic payments. So when I couldn't unseal one of the last older envelopes I knew it was time to get the self adhesive kind. So far they work well and can be stored for long periods of time without the adhesive failing in some way. They actually seemed to be cheaper than the old lick-em style envelope!