When we started riding it was on a comfort bike, then a flat bar road bike?hybrid (Trek FX) and now a road bike. We had a rack on the Trek with a large bag. Heck my wife was bring eveerything and more. She thought it was a portable cooler with extra drinks, food, knife to cut sandwich, etc. in case we got stranded somewhere on our 30 mile ride. Nice touch but it was weighty. I'm just trying to carry what I really need.