[{"id":234523820184,"handle":"tls-lumbar-packs","title":"HIKING LUMBAR PACKS","updated_at":"2026-02-21T05:06:46-07:00","body_html":"","published_at":"2021-01-06T08:59:32-07:00","sort_order":"price-desc","template_suffix":"","disjunctive":false,"rules":[{"column":"tag","relation":"equals","condition":"Shop: Hiking Lumbar Packs"}],"published_scope":"web","image":{"created_at":"2021-01-06T09:00:20-07:00","alt":null,"width":2000,"height":797,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/00efbdcacf52d3781e3fc98d9cfc00d6.jpg?v=1609948820"}},{"id":234523787416,"handle":"all-lumbar-packs","title":"LUMBAR PACKS","updated_at":"2026-02-21T05:06:46-07:00","body_html":"\u003ch2\u003eThe Lumbar Pack—a cornerstone of the outdoor industry for 40+ years\u003c\/h2\u003e\n\u003cp\u003eMountainsmith’s iconic lumbar packs offer rugged versatility and are the measure by which all other waistpacks follow; and we've been doing it since 1979.\u003c\/p\u003e","published_at":"2021-01-06T08:59:32-07:00","sort_order":"manual","template_suffix":"","disjunctive":false,"rules":[{"column":"tag","relation":"equals","condition":"Shop: Lumbar Packs"}],"published_scope":"web","image":{"created_at":"2021-01-06T09:00:16-07:00","alt":null,"width":2000,"height":797,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/465df3055a7259cc11f459b4f7d6bfa0.jpg?v=1609948816"}},{"id":234528407704,"handle":"new-gear","title":"NEW GEAR","updated_at":"2026-02-21T05:06:46-07:00","body_html":"\u003ch2\u003eNewest Gear Drops for 2026.\u003c\/h2\u003e\n\u003cp\u003eCome find the latest and greatest with our all new gear additions to the Mountainsmith line-up for 2026. New Zerk UL packs and accessories for your next long trail hike? New EVO packs and accessories for really gettin' after it? New outdoor lumbar for your next adventure? Yeah, it's all here.\u003c\/p\u003e","published_at":"2021-01-06T09:02:29-07:00","sort_order":"price-desc","template_suffix":"","disjunctive":false,"rules":[{"column":"tag","relation":"equals","condition":"Shop: NEW GEAR"}],"published_scope":"web","image":{"created_at":"2021-01-06T10:01:59-07:00","alt":null,"width":801,"height":641,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/New_for_2020.jpg?v=1771456516"}},{"id":260899471512,"handle":"pro-discount","title":"NON DISCOUNT PRODUCTS","updated_at":"2026-02-21T05:06:46-07:00","body_html":"","published_at":"2021-03-02T07:58:45-07:00","sort_order":"price-desc","template_suffix":"","disjunctive":true,"rules":[{"column":"variant_compare_at_price","relation":"equals","condition":"0"},{"column":"is_price_reduced","relation":"is_not_set","condition":""}],"published_scope":"web"},{"id":234523721880,"handle":"products","title":"SHOP","updated_at":"2026-02-21T05:06:46-07:00","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":"2026-02-21T05:06:46-07:00","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":435561464041,"handle":"zerk-series","updated_at":"2026-02-20T05:08:36-07:00","published_at":"2024-06-25T13:42:41-06:00","sort_order":"manual","template_suffix":"","published_scope":"web","title":"ZERK SERIES","body_html":"","image":{"created_at":"2025-03-04T13:17:38-07:00","alt":null,"width":2240,"height":1260,"src":"\/\/mountainsmith.com\/cdn\/shop\/collections\/AZ_Trail_Blog_Banner.png?v=1771456938"}}]
["Backpacks: Zerk Series","Inline","Shop","Shop: ALL NEW GEAR","Shop: ALL NEW Shop: Hiking Lumbar Packs","Shop: ALL NEW Shop: Lumbar Packs","Shop: Hiking Lumbar Packs","Shop: Lumbar Packs","Shop: NEW GEAR"]
NEW FOR 2026! This ultralight waist pack is part of the new modular Zerk carry system. The Zerk 3L Loki Lumbar is the solution for lightweight organization on the trail, in the backcountry or around town.
The Zerk 3L Loki Lumbar pack is an ultralight wizard.
This pack features innovative modular functionality with our Zerk 20, 40 and 55 liter UL packs. The Loki Lumbar uses the same waistbelt webbing style attachment as two of its big brothers (the 20 & 40 liter), so you can bring both the Loki and a Zerk backpack on your thru-hike...while carrying only one waistbelt! Or utilize the standout feature - remove the 38mm waistbelt and use the accessory straps (x4) to fit as a chest carry pack on the Zerk 20, Zerk 40* and Zerk 55 liter packs; offering greater carry options for your long mile days. Features include a zippered main compartment with a zippered mesh stash pocket, front panel accessory pocket with key clip, backpanel pass-thru loops to use as front carry with existing 38mm backpack waistbelts, and a bright yellow lining to make finding your items easy.
*Zerk 40 is shown with the Zerk 3L Loki Lumbar used as a chest pack in above product photos.
FEATURES
1.5” forward adjustable waistbelt webbing with buckle closure
Main compartment zippered mesh accessory pocket
Front panel accessory pocket with internal key clip
Rear panel stealth pocket for quick access items
Internal divider sleeve panel
Hidden front panel clip-in loops
Security webbing loop in main pocket for personal protection devices
CALIFORNIA WARNING: Cancer and Reproductive Harm | www.P65Warnings.ca.gov