[{"id":401545756905,"handle":"free-shipping","title":"FREE SHIPPING","updated_at":"2026-03-10T05:08:21-06:00","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":234523820184,"handle":"tls-lumbar-packs","title":"HIKING LUMBAR PACKS","updated_at":"2026-03-10T05:08:21-06:00","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":"2026-03-10T05:08:21-06:00","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":"2026-03-10T05:08:21-06:00","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":"2026-03-10T05:08:21-06:00","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":"2026-03-10T05:08:21-06:00","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":"2026-03-10T05:08:21-06:00","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"}]
["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"]
UPDATED FOR 2026! One of the industry's first technical hiking lumbar packs, the Day is known for its function-first design. Built with ultra-durable Nylon dobby fabric and gear swallowing volume, the Day lumbar pack is a versatile solution for over-the-shoulder or around your waist carry.
The original technical hiking lumbar pack marches on stronger than ever after 40+ years. Built with ultra-durable dobby Nylon fabric, the Day lumbar pack is as comfortable as it is versatile. Whether you are a hiker, disc golfer, commuter, tailgater, birder, etc. this pack has the 13L carrying capacity for all of your needs. The large main compartment has a padded divider big enough for a tablet; large water bottle pockets on each side hold 1L bottles; the outer zippered pocket can hold quick essentials for easy access; and the Delta Wing Compression System helps keep the pack close to your lower back. Attach the included padded shoulder strap and you just got yourself an outdoor-inspired shoulder/commuter bag. For hikes outdoors, increase the Day's all day functionality with our running vest inspired Strapette EVO shoulder harness for backpack style carry out in the field.
FEATURES
Interior foam padded sleeve for tablet carry
Smartphone compatible zippered waistbelt pockets (Fits plus sized phones)
Strapettes & Strapette EVO compatible for backpack style shoulder strap carry (Recommended for loads 8 lbs+) (Sold Separately)
Tuck-away, removable waistbelt with forward pull adjustment webbing
FreeFlow backpanel padding
Delta Wing Compression System load adjustment
Side reinforced bottle pockets (fits up to 32oz / 1L)
Inner Sanctum™ interior zippered mesh pocket for small valuables
Zippered front panel pocket with key clip
Dual bottom panel compression straps
Removable 1.5” padded shoulder strap
Backpanel headphone/hydration hose port
Security webbing loop in main pocket for personal protection devices
Bright yellow lining promotes visibility
Waistbelt Fit: 28” - 48”
MATERIALS
420d DD Dobby Nylon*
150d High Density Poly Liner*
YKK® Zipper
*There are no intentionally added PFAS in this item
Weight Load: Suggested up to 8-10lbs, increased weight load improves beyond 8 lbs with our Strapette EVO or Strapettes shoulder harness system (Sold Separately)
CALIFORNIA WARNING: Cancer and Reproductive Harm | www.P65Warnings.ca.gov