Zerk 40

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The ideal combo of weight, durability, comfort, and accessibility; purpose-built for thru-hiking

Co-designed with The Real Hiking Viking, a professional hike-really-long-distances-really-quickly-er, the ZERK 40 was born out of a need for an ultralight pack that can withstand the thousands of miles per year that he already covers. Mountainsmith wanted to make sure that this pack would allow him to go farther, to hike longer, and to work more efficiently on the trail. Over the course of 2 years of development, the ZERK 40 went through 4 iterations and over 5,000 miles of testing on the Wind River High Route, the Colorado Trail, the Tetons, and more.


• 1.5” removable waistbelt
• Large main compartment holds up to 40 liters of gear
• 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 bungee cord (included)
• Removable interior laser cut frame sheet (EVA Atilon) allows for rigidity and airflow
• Extra wide shoulder straps with adjustable sternum strap (includes safety whistle)
• 4 Large mesh front pockets on shoulder straps (2 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

-- 210d EXTREEMA Recycled Nylon Ripstop (UHMPE)
-- Recycled 210d nylon SD oxford
-- Nylon 100D x Span 840D stretch mesh

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