Hi, all

I want to make some simple stuff like a pad extender, some stuff sacks and that sort of non critical stuff

I don't have a sewing machine and can't justify buying one. Is there any sort of glue or cement that could be used to make the seams?

I was looking at the seams of a self inflating pad, and it looks to be a glued joint, or would it more likely be ultrasonically welded?