Day Lumbar Pack



The lumbar pack that started the craze in the 80s, the Mountainsmith Day pack lives on in its modern incarnation as a favorite of hikers and outdoor-minded travelers. With a broad swath of versatile uses, this pack tends to become a cherished possession in every outdoor enthusiast’s gear closet. However, it does not stay there long as it gets used daily as a hiking pack, disc golf bag, messenger bag, office briefcase, carry-on travel solution, diaper bag, and whatever else you can think of.

Built with ultra-durable ripstop Nylon fabric, the Day lumbar pack will become your outdoor security blanket as it logs countless miles adventuring with you around the world. Though the design honors the 40+ year history of this waist pack and has not changed much in shape, modern features make this version of the Day the best yet.


Mfg Sku/Part Number:
One Size
Pack Volume:
800 in3 / 13 L
1.75 lbs / 0.79 kg
13 x 12 x 6 in. (L x H x D)
Waistbelt Fit:
28 - 48 in.
420 Oxford Nylon
420 HD Nylon Ripstop
YKK® Zipper
210d Nylon Liner
Other Features:
  • Tuck-away waistbelt with forward pull adjustment webbing
  • Front stash pocket with elastic cord compression
  • Strapette compatible (sold separately)
  • Interior foam padded sleeve for tablet carry
  • Smartphone-compatible waistbelt pockets (Fits plus-sized phones)
  • FreeFlow ridged EVA backpanel padding
  • Backpanel stash pocket ideal for securing passport, boarding pass, etc.
  • Delta Wing Compression System load adjustment
  • Side reinforced bottle pockets (fits up to 32oz/1L)
  • Inner Sanctum™ interior zippered compartment for small valuables
  • Bright yellow liner promotes visibility
  • Zippered front panel pocket with key clip
  • Bottom panel compression straps
  • Removable 1.5-inch shoulder strap
  • Headphone port

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