I've also seen a glue-less paper binding trick where two pieces of paper are finely crimped together with some high pressure tool in alternating v^v^v^ patterns, actually making tiny tears in the paper. Does anyone know what kind of tool does that?
It's a bit hard to search for, because they make one that punches a hole too (shows up in the video).
You can repeat the process as many times as you want and there won't be any new damage to the paper. With a paperless stapler you would have to do new damage to the paper each time. Also, a regular staple is pretty much forever while these crimped folds can eventually come loose again.
In US, you can find it on Amazon for 15-20 bucks.