I bought these envelopes after having a box of the 'moisten to seal' #9 sized envelopes in my home office for years. Over the years the glue on the old envelopes dried up and was no longer useful as an adhesive when moistened. I was having to close every envelope I mailed with scotch tape. What a pain. The envelopes require no moistening to seal. Just peel the tape off the flap and close. Also the #10 size allows me to stuff at least 6 more 8.5"x11" pieces of paper into one envelope than the #9 did. That's very helpful when trying to cram large folded contracts into a single envelope. I highly recommend these. I will report back in a few years if the adhesive on these starts to become weak...
These envelopes with the easy seal strips are so much better than the old lick or sponge kind. Also almost any kind of label sticks really well to the front of the envelope. While the size I bought was for a business mailing it is really nice to be able to get almost any size for other mailings with the easy seal. I will never buy envelopes without the easy seal again! It's also nice to have a choice between those which are shaded on the inside for mailing checks etc. and those without shading for just letters. I like choices!!!