MountainsmithMountainsmith Zerk 40 Ultralight Backpack
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MountainsmithMountainsmith Zerk 40 Ultralight Backpack
MountainsmithMountainsmith Zerk 40 Ultralight Backpack
MountainsmithMountainsmith Zerk 40 Ultralight Backpack
MountainsmithMountainsmith Zerk 40 Ultralight Backpack
MountainsmithMountainsmith Zerk 40 Ultralight Backpack
MountainsmithMountainsmith Zerk 40 Ultralight Backpack

Mountainsmith Zerk 40 Ultralight Backpack

WEIGHT: 765G
£159.99
By Mountainsmith
Minus Plus
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Free Delivery in the UK: Available on all orders over £50.

Next-Day Delivery: Available for orders placed before 3 PM with DPD (additional charges apply).

Secure Checkout: Includes theft protection for added peace of mind.

Refunds & Exchanges: Contact us within 30 days for hassle-free returns or exchanges.

CO-DESIGNED WITH RENOWNED THRU-HIKER THE REAL HIKING VIKING

Co-designed with Former Marine and renowned thru-hiker The Real Hiking Viking, the updated ZERK 40 pack stands alone as the ideal combination of lightweight durability, comfort, and accessibility. New updated version includes added daisy chain attachment points, dual ice axe loops, dual side compression straps, and embroidered design. 

FEATURES OF THE ZERK 40

  • 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

  • What We Think

    Co-designed with The Real Hiking Viking, a professional 'hike-really-long-distances-really-quickly', the ZERK 40 was born out of a need for an ultralight pack that can withstand the thousands of miles per year that The Real Hiking Viking already covers. Mountainsmith wanted to make sure that it 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.

  • Specifications

    MATERIALS
    210d EXTREEMA Recycled Nylon Ripstop (UHMPE)

    Recycled 210d nylon SD oxford

    Nylon 100D x Span 840D stretch mesh

    DIMENSIONS
    22" x 14" x 10"

    Waistbelt max 48"

    Torso range 16" - 19"

    VOLUME
    40 L with fully extended collar
    32L with roll-top compressed

    CAPACITY
    Up to 14 kg

    WEIGHT
    822 g with accessories. 765g without accessories

  • Weight

    765 g

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Valley and Peak Promise

"The Valley and Peak promise is built on three pillars: thoughtfully curated gear, exceptional customer service, and a genuine love for the outdoors. As an independent, family-run business, we carefully select products from a wide variety of cottage gear brands and trusted names, ensuring that each item is rigorously tested and loved by our team. Our customer service is a cornerstone of our brand, offering personalised support to help you choose and care for your gear with confidence"

Jim De'Ath, Managing Director