In cases like these, Scotch Up! comes in handy. It looks like any other glue stick, but the glue is repositionable. So you can make a post-it note out of every piece of regular paper. No surprise: it’s a 3M product, the company that also invented post-its and lots of other useful office supplies.

Best thing is, it actually works. The paper becomes restickable; I’ve tried it and ten times of repositioning later, the paper stuck as well as the first time. Handy!