I just picked up a Dinotte tail light. A real review of the light is coming later after I get a chance to try it out. Mounting the light has been a challenge for many the simple O-ring system included works great for front lights, not so great for tail lights. Dinotte’s released an updated frame mount recently, but I’d rather have the light on my excellent Alchemy Goods messenger bag since I frequently switch bikes but always bring my bag.
Here’s a mounting option I made for the bag, out of $4 of pvc pipe. It tucks into the external side pockets on the messenger bag. The mount let’s me adjust the aim of the light both left/right and up down.