Mountainsmith Zerk Backpack - Lightweight Bag for Hiking, Backpacking, Trekking, & Thru-Hiking - Darknight - 40L

Available in 40L and 20L sizes, the Mountainsmith Zerk Backpack has been tested and developed through tens of thousands of hiking miles to keep you moving faster, longer, and more efficiently on ultralight hikes. It carries incredibly comfortably with wide, padded shoulder straps inspired by trail runner vests, and the framesheet, bungees, and waistbelt are removable for a completely modular design. A plethora of accessories like Mountainsmith’s Zerk 7L Top Lid, and Loki (all sold separately) let you customize your organization just how you like it. A wide main compartment holds most of your gear alongside a hydration bladder in its own sleeve (sold separately), while the roll-top closure adds a few more liters of space when you need it. Complete with a front stretch stash pocket and shoulder strap pockets for on-the-go essentials, the Zerk is your new go ultralight pack for any trail mission.

• Zerk UL Series | Collection of ultralight backpacks built with the help of The Real Hiking Viking for long-distance, fast-and-light hikes.
• Carrying Comfort | Trail runner vest style shoulder straps are extra wide, padded, and have plenty of pockets, and the EVA framesheet and waistbelt are removable for modular customization.
• Pocket Layout | Front stretch pocket with bungee, dual water bottle side pockets, 4 shoulder strap pockets, and an internal hydration sleeve ensure succinct organization.
• Roll Top Closure | Roll top ensures secure, compressible closure, and it’s compatible with Mountainsmith’s Zerk 7L Top-Lid (sold separately).
• Tech Specs | [Dimensions] 20 x 12 x 9in; [Torso Size] 16 - 21in; [Waistbelt] 28 - 48in; [Weight] 2lb 2oz; [No Straps, Bungee] 1lb 15oz; [Volume] 40L (2441cu in); [Capacity] 35lb; [Material] 100D Robic X-Grid, Extreema Ripstop, UTS Coating; 210D Robic X-Grid, Extreema Ripstop, UTS Coating; Nylon 100D x 840D Stretch Mesh; Atilon & EVA