Interesting.
Eden, did you get the Nalgene OTG bottle?
It says the Firefly works on "wide mouth" bottles and was wondering if that was wide enough.
I suppose, tho', that it eliminates your being able to actually DRINK from the waterbottle - while on the bike - right? My second cage holds my coffee thermos (and I'm not giving THAT up!), so I'm kind of running out of real estate on the frame. I could, tho, squish the thermos in the panniers.
Hmmmm....always like more light!