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Frost River Back Bay Lumbar Pack

Frost River


The Frost River Back Bay Lumbar Pack is sizable and is designed to haul a lot while keeping the load comfortably situated on your hips. A durable and breathable cotton web pistol belt slides through a sleeve at the back of the pack, while cotton web transfer straps cinch the pack to the belt for a stable carry. The transfer straps form a Y to stabilise 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 hold 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.

The Back Bay features a large main compartment with padded back and sleeve, plus several internal attachment points. The front offers a zippered slip pocket for smaller items. Daisy chain inside the pocket mirrors the exterior webbing and helps with organisation of pens, tools, and other small items.

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 (compliment your pack with a pair of leather bedroll straps, here).

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 an overnight, on a bike, on cross-country skis, or exploring the woods, the Back Bay Lumbar Pack is a versatile companion that will adapt to almost any adventure.

See our video review here



  • Size: 23H x 30.5W x 10.5D cm
  • Cotton binding, 10.10oz army duck waxed cotton canvas,
  • Solid brass hardware, heavy duty nylon thread,
  • Oil tanned HH vintage boomer leather
  • Deep mahogany full grain bridle leather
  • Nylon diamond braid cordage
  • Heavy duty coil nylon zip
  • Cotton web waist belt, 2.25" / 5.62cm with cinch straps and brass buckle (fits 32-42" / 80-105cm)

Customer Reviews

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Customer Reviews
4.9 Based on 8 Reviews
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Peter W.
United Kingdom United Kingdom

Superb carrier

The back bay lumbar pack, is a superb piece of kit, big enough for me to carry enough kit for a day on the river fishing, or as part of my multi day kit, probably use it to carry the gear I need to start my camp, fire starting, brew kit, water I think you get the idea. Now to the bag, made to the usual Frost River quality pack is built to last and I hope it’ll give me many years service; now what I don’t like is the belt, it’s way to small, I would say ridiculously small for a field pack, I’m quite large and wouldn’t go anywhere near me and I’m not sure your average person would be able to wear it with a padded coat on, the first thing I’ve done is customise the belt by removing the old leather strap and fitting a new leather strap better fitting for me. The other thing is the price, it’s expensive compared with my expedition summit, it’s very expensive, so do I regret buying it? For the price possibly, do I regret owning it? Absolutely not, I love it and recommend it if you’re in the market for such a bag.

United Kingdom United Kingdom

Lumbar pack

I had been debating between this or a haversack for a while but absolutely made the right. The side pockets fit a 1l water bottle perfectly, the front zip it’s an OS map and compass there’s plenty of space in the main compartment and I use the lashing points underneath to attach a dry bag with waterproofs and warm kit on a day hike. I’ve also used this in conjunction with my Isle royal on multi day hikes and it’s when you want to drop off your main load and push on to a summit or do camp bits. Couldn’t have arrived faster if it was teleported

United Kingdom United Kingdom

Lumbar bag

I wanted this to replace my backpack . It's perfect for my needs, big side pouches which hold a decent sized water container and lots of room in the main zipped compartment . I like the colour and it's well made , I'm more than happy with my purchase .

Philippe D.
United Kingdom United Kingdom


Good website, range of products and range of payment options. Good communications. Very fast dispatch, well packed +++

John M.
United Kingdom United Kingdom

Frost River Back Bay Lumbar Pack

We use lumbar packs extensively at work and this is by far the best I’ve come across . From the high quality materials to how well it carries loads I cannot praise this highly enough. Yes it may be pricey but it’s worth every penny. The bedroll straps are a brilliant addition for carrying lightweight jackets. Great service from Naturalman .

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