The sizable Back Bay Lumbar Pack keeps your load comfortably situated on your hips.


The Back Bay features a large main compartment with padded back and sleeve, plus several internal attachment points. The front offers a slim zippered slip pocket for smaller items. Daisy chain inside the pocket mirrors the exterior webbing and helps with organization of pens, tools, chemlights and other small items you might need. On the bottom of the pack are two low profile bridle leather lash squares, perfect for a small bedroll, tarp, tripod or other larger piece of gear. Sturdy, solid brass D-rings at the end of the heavy-duty main zipper provide attachment points for a shoulder strap. Two small tabs at the back of the pack provide options for stowing the load transfer straps when not in use. The lash squares, web attachments and D-rings keep the Back Bay versatile, as a standalone piece of equipment, or attached to an Isle Royale Jr, Mini, or other mid-size pack. Whether you’re on a portage, on a bike, on cross-country skis, or exploring the back 40, the Back Bay Lumbar Pack is a versatile companion that’ll adapt to most any adventure and keep your gear close.

Features & Specifications


SIZE: 12in W x 9in H x 5in D

POCKETS: 3.75in W x 6.5in H X 3.75in D

MATERIALS: Cotton Binding, 10.10oz Waxed Cotton Canvas, Solid Brass Hardware, Premium Leather, Cotton Web, Nylon Diamond-Braid Cordage, Heavy Duty Coil Nylon Zipper.


When you invest in a Frost River made-in-the USA item, you’re not just getting gear that’s handcrafted and locally-made, you’re getting a piece made with intent. 
  • Lifetime Guarantee and robust repair program to keep your Frost River gear going for years to come.
  • Premium Materials sourced from businesses that have sustainability in mind.
  • Solar-Powered Manufacturing facility allowing us to craft Frost River goods with clean, renewable energy.
  • Investments in Technology that ensure the highest yield of our materials is consumed.
  • Made in USA

  • 30 - Day return

  • Secured payment

  • Quality Assurance

We've got your back

  • Made In USA

    Duluth, Minnesota

  • Lifetime Guarantee

    Build to Last

  • Handcrafted

    Heritage Goods

  • Premium Materials

    Raw Reliability

A durable and breathable cotton web pistol belt slides through a sleeve at the back of the pack, while cotton web load transfer straps cinch the pack to the belt for a stable carry. The transfer straps form a Y to stabilize the load across two rows of web daisy chain that cross the front of the pack. The daisy chain offers multiple attachment points: string some cord to carry a layer, attach accessories or clip a carabiner. At each end of the Back Bay are drawstring ECO pockets that provide a spot for water bottles or smaller things you’d like to keep close at hand. Hidden behind the ECO pockets are sleeves that allow the load transfer straps to be threaded behind the pocket, close to the pack, for ease-of-access to the pockets, or wrapped around the pocket for an exceptionally stable carry.


SIZE: 12in W x 9in H x 5in D

POCKETS: 3.75in W x 6.5in H X 3.75in D

MATERIALS: Cotton Binding, 10.10oz Waxed Cotton Canvas, Solid Brass Hardware, Premium Leather, Cotton Web, Nylon Diamond-Braid Cordage, Heavy Duty Coil Nylon Zipper.



Tales from the trail

Explorer Duffels
Explorer Duffel Collection
Recycled Remnants
Recycled Remnants
Lash Square
Lash Squares: Unveiling Their Purpose
Bushcraft. What Is It?
Bushcraft. What Is It?


Customer Reviews

Based on 7 reviews
Dallas Holm
Got your back!

Lumbar back pack is well thought out, lots of space, and made with such quality. Let’s the load lay just as it should!


Just the correct size. Fits very comfortably on my hips and I don’t hit it with my elbows while walking. Very well manufactured with quality I expect. Great for me.

Connor Yockey
Deep woods tested, flying colors

I have had this pack for close to 3.5 months now and have taken it on many small adventures, but waited until I went for long-term island-hopping trip before posting a review. This pack has stood up to the deep uncharted woodlands on the MN and Canada border, pushing through endless branches without hardly a scratch. It can take plenty of rain but still keep in mind that it is best to keep things made from natural materials like this from getting soaked. Plenty of space, I especially love the wide face for attachments. This is unshown from the pictures, it comes with 2 strap loops at the bottom in case you want to put a bed roll or something below. I do wish the water bottle holders went slightly deeper; I wouldn't be surprised see a water bottle that isn't clipped on falling out if you jump hard enough. Still, this is my favorite product I've ever owned from Frost River.

Blaine G
Back Bay Lumbar Pack

I like the pack, though I have just received it and not used it yet. It appears well made and suitable for my intentions.

I have, however, noticed already that the water bottle pockets need to be a little deeper and/or the draw cord longer. Yes, the 32oz stainless steel water bottles with the nesting cups do fit but they stick up just over getting them cinched in with the draw cord, especially if you put the nesting cup lid in the bottom below the cup/bottle assembly. And you definitely cannot get them cinched with the camp stove added to the group, though it will fit too (Self Reliance Outfitters set). If the draw cord was longer, at least that could be laid over the bottle cap to cinch down so that the bottle doesn't easily slide out of the cup. Looks like that's a cord modification I'll need to make so I don't lose my bottles.

Back Bay Lumber Pack

This pack is well made and better yet well thought out. Highly flexible and able to meet a variety of needs. I really like the size and think it will work well even for a carry on for my personal items