Today's craft is something I made about a decade ago. I got a mandolin as a gift and wanted a case to keep it in. It turns out my mandolin is a slightly off-standard shape and having a case custom made would have been prohibitively expensive. So, I decided to make my own case out of corrugated cardboard, an old egg-crate mattress pad, hot glue, fleece, and duct tape. I've been using that same case ever since. Ten years and I'm only just now needing to add new tape.