Mountainsmith Zerk 40 Liter Backpack

Countless hours, thousands of miles, a hundred beers, and one giant beard later and the folks at Mountainsmith® are proud to introduce the Zerk™ 40. Co-designed with The Real Hiking Viking, a renowned thru-hiker with thousands of hiking miles under his belt, the Zerk 40 pack stands alone as the ideal combination of weight, durability, comfort and accessibility.

• Large main compartment
• Roll top closure with side compression SR buckles; opposing SR buckles for self-closing roll top
• Side compression straps for securing load throughout entire pack
• Large side water bottle pockets with angled opening to easily remove and insert items while on-the-go
• Expansive front mesh pocket for hauling bulky gear
• Large mesh side stash pockets with angled opening for easy reach
• Reflective screen printing and cord loops for low light visibility
• Front cord loops can be configured with included bungee cord 
• Removable interior laser cut frame sheet (EVA Atilon) allows for rigidity and airflow
• Extra wide shoulder straps with adjustable sternum strap (includes safety whistle)
• Four large mesh front pockets on shoulder straps (two per side)
• EVA foam padded shoulder straps
• Removable bear canister and accessory over-top webbing straps with SR buckle closure
• Front panel bungee attachment system
• Removable 1.5″ waistbelt
• Color: Phantom
• Materials: 210D Extreema™ recycled nylon ripstop (UHMPE), recycled 210d nylon SD oxford, nylon 100D x span 840D stretch mesh
• Volume: 40 liters (with fully extended collar), 32 liters (with roll-top compressed)
• Torso range: 16-19″
• Dimensions: 18.5″ x 11.75″ x 5.75″
• Waistbelt max: 48″
• Capacity: Up to 30 lbs.
• Weight: 1 lb. 13 oz. (with accessories), 1 lb. 11 oz. (without accessories)