Features of the Thule Rail Hip 2L Pack One-handed, behind the back access to phone in soft, structured pocket Carry up to two water bottles in side pockets for longer rides Side pockets collapse giving a streamlined Fit for shorter rides when no water bottles Are needed Ride in comfort and descend with confidence with superior stability and breathable materials Organize tools and clothing accessories in interior pockets Quickly access nutrition with side jersey pockets Stay visible with a blinky light attachment loop