Fit & Design: Fixed top lid with zippered pocket for organizing smaller items Bellowed front fabric pocket stores rain gear for easy access when skies darken, or wet gear after the downpour stops Dual access fabric side pockets for water bottles or smaller items with removable InsideOut compression cord Pocket perfect to fit hydration reservoir Technology: Internal main compartment compression strap Top lid cord loop attachment points for external gear attachment Constructed with NanoFly fabric that integrates high-molecular weight ripstop and nylon for a lightweight pack that doesn't sacrifice durability Breathable mesh back panel with strategic side ventilation offers ideal airflow so you stay cool throughout long adventures Additional Details: Sternum strap with integrated safety whistle