Wide mouth, bucket style main compartment opening with internal zippered mesh pocket and key clip External hydration sleeve accommodates up to a 3L reservoir (sold separately) Adjustable shoulder harness to dial in perfect fit Stretch mesh pockets on both sides of pack provide convenient storage for bottles and smaller items. Two zippered hipbelt pockets and top panel external zippered slash pocket for easy-access storage Stow-On-The-Go Trekking pole attachment allows you to quickly attach and carry trekking poles while wearing the pack. For Large/X-Large Recommended load range: 15-25 lbs | Pack weight: 2.68 lbs | Dimensions: 26.38 x 12.2 x 10.63 inches | Volume: 36 Liters