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Bag Hook for a Desk Edge or a Chair Back

Clamps onto a table edge, a desk lip or a chair backrest and gets the backpack off the floor. One part, no supports, no screws, no glue. Three sizes included — 20, 25 and 30 mm jaws — and a sprung tongue inside each takes up the slack below that, so between them they cover roughly 10 to 30 mm. A 7-minute fit-test coupon is included for every size so you can check the grip on your own table before printing the whole thing. The source file is included and fully parametric: change one number and you get a jaw for any thickness.