Backpack holder for bike's rear rack

thingiverse

This is a hook for hanging backpacks on the rear rack of the bike. Print 2 times both front and back, screw it together with 3mm screws(M3) and bolts. The length of the screws depend on the thickness of the backpack shoulder strips. After screw it in firmly, the screws should not be too long outside. The M3 screws I'm using are 12mm long.This should be compatible with shoulder strips that are between 5 ~ 6.5 cm wide, the distance between two holes are 6.8 cm.The diameter/thickness of the rack should be lower than 7 mm.Be aware of the strips of your backpack, please avoid the possibility to draw into the wheel.*this is a homemade gadget, not a final product, please use it with your own risk!Feel free to optimize it yourself. If you need private customization of this model, please contact me directly, a minimum fee will be required.