You could use stickers instead of a stamp pad too.I just tried making one - actually, two - with an envelope someone used to give me a Christmas card. Both times the envelope ripped on me. They are fiddly when you try to pop out the bottom. Maybe it'd be better with large manila envelopes instead....
Thank you for the warning. I haven't tried this yet, and yes, I'm not sure how well it will work, but now at least I know to take extra care when I'm fixing the bottom. Good to know.
I think I will just re-use gift bags I have received.
We've been passing ours back and forth in the family for years. Some of them are starting to look a bit sad, though, so they'll have to be retired soon.