Osprey Packs Zealot 15 Hydration Pack Osprey's lid lock easily and securely carries bicycle helmets The blinker light attachment found near the base of the front panel of the pack allows for Quick light attachment for high visibility in the dark A zippered bottom compartment features a removable roll-out tool pouch providing tool organization and a clean work surface Back panel access to the pack's main compartment provides Quick access to an internal zippered hydration compartment and 3L hydraulics reservoir A zippered slash pocket lined with scratch free, heat embossed fabric provides ideal storage for Optics and electronic devices