Handy box from scratch paper
This isn’t original as such, I learned it back when I was into origami as a child, but it took me ages to realize how handy they are. It’s not at all a complex fold, so it should be ok even for people not generally into that sort of thing. I use them continually especially for a quick container to hold screws, bolts, small parts, etc when taking something apart and I’m somewhere where a more normal container isn’t around but a piece of paper is.
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