Need to carry more? Designed for, but no limited to, the shred packers out there rocking a full sus bike....you know....the ones without bottle mounts anywhere. With a 13" circumference/4" diameter, this bag system fits the common Nalgene sized bottle as well as those easy to find and quite reusable 1.5L bottles found in gas stations everywhere. Capable of fitting around old school skinny tubes as well as the latest carbon dream builds (e-bike frames may be the exception), the 2 included straps hold your life sustaining cargo securely unnoticeably as you rip long descents. The roll-top bag keeps all that gnarly dirt and cow poop at bay, allowing you to confidently wrap your crusty lips around the bottle to replenish your body with the pH balanced hydration you purchased for way too much money at that quick stop or the once cloudy pond water you worked so hard to filter 20 miles prior.