Boreas Buttermilks 40 Litre Rucksack

40 Litres / Removable Framesheet
Weighs 1255g (Medium size)
Code: SS14155
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Boreas's Buttermilk packs are tough with a strong frame and hipbelt combo that transfers the load well, with features that will suit backpackers.

Boreas says: Light and uncomplicated. These were designed for those who want to move really, really fast and those who think it’s just plain crazy to carry heavy things around in the woods. A great blend of suspension, structure and weight conscious materials.

The first thing you notice about a Boreas' Buttermilks pack is the stiffness and substantial nature of the back panel - it feels a lot heavier than it actually is - but its the defining feature of the pack. Attached to this is a wide and supportive hipbelt and shaped shoulder straps. The harness achieves impeccable load transfer to the hips making this a comfortable pack for heavier loads.

Boreas packs are not made to be ultralight, they are put together to be tough - so the fabrics used are mid range nylons which add to the weight of the pack but deliver durability. There are some good features, such as the hip belt pockets are quite large and shaped so they are really easy to get in and out of.

Ideal for backpacking, there are large side stretch mesh pockets and a large one on the outside of the pack, as well as a small zipped organiser pocket which is ideal for stuff like wallet, park passes, other paperwork etc that you need handy.

There's no lid, just a drawcord closure with a top webbing strap to hold everything down. You need to ensure you close the top and roll it before securing the strap - this will keep the water out. There's the usual hydration pouch inside the pack and side compression sacks.

The frame is removable which reduces the weight of the pack considerably - but its such an integral part of the carry system that we would only recommend using the pack without the frame for very light loads indeed.

The pack is supplied with its own pack cover which weighs 135g and is not included in the quoted weights. This pack is an excellent choice for someone who wants comfort, backpacker practicality and durablility.

- Reviewed by Ultralight Outdoor Gear

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Help and advice: Choosing a rucksack at Ultralight Outdoor Gear  
  • TOUGH STUFF: Our super-light 100D ripstop nylon pack body fabric is impregnated with silicone for waterproof strength that won’t wear out or rub off over time. The heavier 420D nylon used for the pack bottom is just plain tough.
  • SIMPLE COMFORT: Packs don’t have to be complicated to be comfortable. The z-foam back panel and removable frame sheet are shaped to match the curve of your back. Nothing fancy. (Just lots and lots of prototypes.)
  • COOL IT: Poke the z-foam on the back panel (don’t worry, it’s tough stuff) and you’ll see it springs back. That compression/ reaction motion happens as you hike, pumping air through to keep your back cool.
  • FOAM SWEET FOAM: More foam does not equal more comfort. Super-plush belts and straps look comfy in the store but flatten out under pressure. Comfort happens when pressure is distributed evenly through good design and foam resilient enough to maintain volume under load.
  • KEEP IT CLEAN: There was a time when packs were judged by how many zippers, buckles and straps they had. We’re glad those days are over so we can concentrate on better ideas like daisy chains that tuck away when you don’t need them.
  • Buttermilks 40 Medium
  • VOL: 40L
  • TORSO: 46-51cm
  • Weight: (minimal) 886g
  • Weight: 1255g + 134g pack cover


  • Buttermilks 40 Large
  • VOL: 40L
  • TORSO: > 51cm
  • Weight: (minimal) 874g
  • Weight: 1300g + 135g for pack cover
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