I can't find the right size, either to big or to small

I see. For me, to get it right, i did one so the actual clip thing part is in the gap (front), and the other so the clip part was not in the gap, so it acted like a bigger zip tie. Can always go to ACE or soemthing too, to get perfect ones!

Took it out for a nice long run today. Was raining, so I wrapped the car in a trash bag and some ductape. The inside was perfectly dry after I brought it in. Also, it is lots of fun to backflip off walls and curbs! :lol: