Zerk 40L Backpack by Mountainsmith


$ 219.95


Ships in 1-2 business days | Based in Golden, CO | Est. 1979

Countless hours, thousands of miles, a hundred beers, and one giant beard later and we 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.



  • 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



        • Volume: 40L (with fully extended collar)
        • 32L with roll-top compressed
        • Dimensions: 18.5" x 11.75" x 5.75"
        • Recommended maximum load capacity: 30lbs


        • Torso range: 16"-19"
        • Waistbelt: up to 48"

        Weight: 1lb 13oz (with accessories), 1lb 10oz (without accessories)


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

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