Skadis - Box hanger
thingiverse
This is a tiny hanger/hook for the "Skadis" pegboard from Ikea, which allows to mount boxes with these folded edges at the top. I'm not sure how they are called officially, but I guess they are quite common so maybe this is useful for somebody. Required amount of hangers obviously depends on the size of your box. If it gets too heavy, you might want to add another hanger below the box.
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