Alpinestars At-9 Backpack The Alpinestars At-9 Backpack is built for demanding trails with durable 420D ripstop construction and an ergonomic back panel for added stability. Its modular 9L capacity, magnetic chest closure and hydration system compatibility keep essentials organized so the rider can stay focused on the trail ahead. Features: Ultra durable 420D ripstop construction designed for off-road use Ergonomic, pre-shaped back panel with internal structure for enhanced stability Multi-adjustable system featuring a central magnetic chest closure Optimized comfort to reduce fatigue during long rides Hydration system compatible (available separately recommended: Hydrapak 3L or smaller) 9L capacity with integrated expansion pocket Large, wide-opening main compartment with auto-locking zippers Ergonomic compression straps with top adjustment to keep the pack close to the body Integrated side compression straps to reduce overall volume Reinforced top handle for quick transport Internal mesh pocket, ideal for organizing riding essentials Multiple attachment loops and Molle panel for radios and accessories Expandable, ventilated external compartment with speed-lace system Removable waist belt for a customizable fit