I have six bikes and get bored with one and decide to ride the other frequently. It would be really convenient to mount my killer taillight on my helmet. On some of the bikes seatpost mounting is out of the question because the taillight would be obscured by my emergency toolkit bag.
So, in order to move a Dinotte 300r from bike-to-bike it needs to be on the back of the toolkit bag or on the back of my helmet. How viable are either?
Alternatively, I could obtain several mounts for somewhere on the rear frame, I suppose.