I designed this luggage hook for my Ninebot Max G30. It is built in two halves that are clamped to each other by M3 nuts and bolts. It also has optional holes to attach a velcro fastener.

This hook has worked great for me over the last few years. Unfortunately, I can no longer include a picture of the finished product as my Ninebot was stolen recently. Anyway, I hope that you will find good use for this model.