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["Gift Guide","Inline","Shop","Shop: Backpacks","Shop: Hiking Backpacks","Shop: NEW GEAR"]
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.
Co-designed with The Real Hiking Viking, a prominent long distance hiking machine, this pack was developed over two years with one mission; to go faster, further, and lighter. After over5000 miles of testing in the Rockies, this pack is on its 5th generation of design upgrades. Built withultra-light and durable materials, the Zerk 40 will be your best friend and greatest asset when out on the trail.
FEATURES
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
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 / 2440 CI with fully extended collar
32L / 1952 CI with roll-top compressed
CAPACITY
Up to 30lbs
WEIGHT
1lb 13oz with accessories, 1lb 11oz without accessories
Planning to do the Camino de Santiago and needed a versatile lightweight backpack. The Zerk 40 is perfect for what I need. Duper comfortable and versatile with all of the capacity and extra pockets.
C
Chuck Littleton
Top Notch Quality.
I normally go ultra light but during the cooler weather here in Florida I needed a larger pack. Especially one that will comfortably take a few bulkier winter items like a quilt for my hammock and long sleeve shirts for me. Didn't need a fancy one with all the bells and whistles , just one that's proven to be practical and works. I have other Mountainsmith products and all of them are top notch , quality items.
R
Random Canadian
Absolutely perfect!
This backpack is *solid* and the perfect solution for lightweight to ultra lightweight hiking. I've loaded the pack with 30 lbs of content plus various extra things hanging off it (stove, fuel bottle, sleeping bag). Very comfortable even this loaded, the weight mostly transfers to the chest area. The multiple options for closing the roll-top and the webbing for attaching multiple items by carabiner are super convenient as is the front pocket for easy access to items (I stick extra socks, a hat gloves and my emergency med kit here). The side and chest strap pockets are also a big win, all can be accessed without removing the pack. I am in love with it, I literally can't think of anything wrong with it. One caveat is that I didn't feel much need for the detachable hip belt, but others whose packs are packed with a different weight distribution etc. may find it useful. This is in my top 3 favourite outdoor gear purchases.
M
MadmanBlueBox
They thought of everything.
For thru-hiking folks this is a revelation. All the pockets can be accessed without taking off the pack which means less opportunity for those mice and squirrels to laser in like they do (IYKYK). Holds a 3.0L bladder easily. Has every attachment point you can ask for as well as an easily removed hip belt. Run the matching bum bag as well for even more utility. They knocked it out the park.
D
David
This pack is absolutely amazing
got my new pack in today as an older fellow at 56 years old I love to go backpacking and through hiking but the weight is just killing me specially the hills so I’m looking to drop weight, starting with my backpack and I do believe I found the pack I was looking for with some changes and gear. This baby is going to make life a lot easier on me. Absolutely recommend this pack. It is great.
The Zerk 40 was awarded The Best Fast and Light Pack by The Trek. It is featured in their Best Backpacks for Thru-Hiking of 2022.
