Sustainability: Constructed with Bluesign sustainable materials, reducing environmental impact. Features a PFC/PFAS-free durable water-repellent coating for eco-friendly weather resistance. Specs: Fits 15?19" torso (S/M) or 18?22" torso (M/L) Spacious, full-height middle compartment with mesh pockets for organization Front zip pocket with key clip for quick access Lower V-Compression pocket for additional quick-retrieval storage Design Details: Panel loading design for easy gear organization, so you can access equipment quickly Padded hipbelt with support and extra storage: zippered pocket and stretch mesh pocket for keys, phone, snacks, etc. External hydration sleeve for direct water access during hikes AirScape back panel with Atilon foam distributes weight evenly and offers maximum ventilation with a mesh-covered air channel Upper compression EVA shoulder straps with quick-release capability Trekking pole loops for easy carry when not in use Blinky light attachment located at the front base of the pack for visibility in low light Adjustable sternum strap with rescue whistle for safety Dual-sided stretchy mesh water bottle pockets Additional Details: Brand: Osprey