[{"id":401545756905,"handle":"free-shipping","title":"FREE SHIPPING","updated_at":"2026-02-26T05:06:36-07:00","body_html":"","published_at":"2022-03-17T11:37:11-06:00","sort_order":"best-selling","template_suffix":"","disjunctive":false,"rules":[{"column":"variant_price","relation":"greater_than","condition":"79"},{"column":"variant_inventory","relation":"greater_than","condition":"1"}],"published_scope":"web"},{"id":234523721880,"handle":"products","title":"SHOP","updated_at":"2026-02-26T05:06:36-07:00","body_html":"\u003ch2\u003eThe entire Mountainsmith product line—A to Z.\u003c\/h2\u003e\n\u003cp\u003ePlease choose a product type from the menu on the left to narrow down your selection.\u003c\/p\u003e","published_at":"2021-01-17T11:44:24-07:00","sort_order":"alpha-asc","template_suffix":"","disjunctive":false,"rules":[{"column":"variant_price","relation":"greater_than","condition":"1"},{"column":"variant_inventory","relation":"greater_than","condition":"1"}],"published_scope":"web","image":{"created_at":"2021-01-17T11:41:41-07:00","alt":null,"width":2000,"height":797,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/Shop_Category_Image_1-17-2021.jpg?v=1610908902"}},{"id":204574720152,"handle":"all","title":"SHOP MOUNTAINSMITH","updated_at":"2026-02-26T05:06:36-07:00","body_html":"\u003ch2\u003eGolden, Colorado—Since 1979\u003c\/h2\u003e\n\u003cp\u003eMountainsmith was founded on the need to build durable gear that could withstand the rigors of extended trips into the Rocky Mountain backcountry. This unwavering spirit, drive, and determination continues to fuel our mission today. We dedicate ourselves to designing, testing, and refining outdoor gear that genuinely ‘\u003cstrong\u003eGoes Where You Go\u003c\/strong\u003e’. Join our diverse community of weekend warriors, global adventurers, outdoor professionals, and everyone in between, united by a shared passion for outdoor exploration and embracing life on the trail. \u003c\/p\u003e","published_at":"2020-07-01T13:47:23-06:00","sort_order":"best-selling","template_suffix":"","disjunctive":true,"rules":[{"column":"variant_price","relation":"greater_than","condition":"1"},{"column":"variant_inventory","relation":"greater_than","condition":"1"}],"published_scope":"web"},{"id":234528506008,"handle":"the-outpost","title":"THE OUTPOST","updated_at":"2026-02-26T05:06:36-07:00","body_html":"\u003ch2 style=\"text-align: left;\"\u003eWelcome to The Outpost\u003c\/h2\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cb\u003eThe Outpost\u003c\/b\u003e is where select Mountainsmith gear lives after leaving our main lineup. Find previous year styles, limited colors, and trail tested designs built to our Function First Design standards since 1979. \u003cb\u003eDiscounted gear while supplies last.\u003c\/b\u003e No minimum purchase. Free shipping on orders over $79.\u003c\/p\u003e","published_at":"2026-01-22T12:05:08-07:00","sort_order":"price-desc","template_suffix":"no-title","disjunctive":true,"rules":[{"column":"tag","relation":"equals","condition":"SALE: Warehouse Clearance"},{"column":"product_metafield_definition","relation":"equals","condition":"gid:\/\/shopify\/Metaobject\/59067597033"}],"published_scope":"web","image":{"created_at":"2026-01-21T16:37:20-07:00","alt":null,"width":1920,"height":1080,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/The_Outpost_Hero_0126.png?v=1769041822"}}]
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
Love this pack. Good for fastpacking as well. Would be nice if there was a smaller size for smaller people.
G
Garrett Pittman
Good fit
It’s nice to find a running vest style pack for bigger guys instead of the normal twig sized running vest packs. Lots of pockets which I like. The bag is big enough for a thru hike if your gear is dialed in for an ultralight kit. I bought mine off a different site that had a sale going on. I like the blue but wish I had gotten the gray version instead.
m
mcBodach
amazing if it fits
Alas! This backpack is great in many ways, but as the name ZERK suggest, you need the build of a Berserker. Dear Mountainsmith: how about a version with a harness fit for the smaller Berserkers among us? Not all heroes come in XL.
B
Brittney
Bag does not fit store will not help
I looked at my last review & noticed you used pictures that are not mine ? That is not the bag i purchased store will not refund my bag for a proper bag that fits i tried the bag on it felt like it would fit once taking it out & filling my gear with it it sat below my butt after. the straps will not adjust properly to pull the bag up & tighten it the shoulder straps do not adjust either
B
Brittney
Too big for me sadly I used it the the first time hiking Mount
I used it the the first time hiking Mount Williamson it was too big for me it sits below my butt i didn’t like it at all I think it was made for a guy not a female it was very expensive for a one time use