The Rail Hip Pack 4 is a hip bag from Thule that allows you to carry everything you need for the trails. Included is a 1.5-liter hydration bladder equipped with a magnetic ReTract hose return system. This ensures that the hose always finds its way back, allowing you to drink at any time without the worry of retrieving the hose from the spokes. In the remaining storage space of the hip bag, organizational pockets keep tools and bars securely stored, and they are just as easily accessible as the phone, which has its own designated compartment.