Extreme Max 5001.5046 Snowmobile 'Attack' Backpack with Built-In Hydration System, Black Luxury features - 3 liter hydration reservoir and hose, top-loading fleece-lined goggle pocket Convenience features - fully open main compartment design for easy access to larger items and tools and external shovel blade storage Comfort features - quilted, padded back panel to maximize airflow and minimize sweat, padded waist strap and narrow lumbar connection Safety features - reflective hits for visibility and side avalanche probe storage 1-year replacement warranty