Backpack hanger for quads
thingiverse
Just a simple holder for 3" and even some 5" quads for backpacks without straps or needing an additional mount. Uses x4 M3 screws and x4 M3 nyloc nuts to attach. Your screw size will vary depending on the thickness of the backpack/material but through my thin one it needed about a 10mm screw. The holes are tight, you might want to drill with a 1/8" drill bit before to make it easier.
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