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Boreas - Buttermilk 55 - Men's

Price: $184.99

Quick Overview

55L ultra-light, ultra-adaptable backpacking pack
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Black Golden Gate Red Buttermilk 55 - Men's Buttermilk 55 - Men's Marina Blue Buttermilk 55 - Men's
Buttermilks are light and uncomplicated. They’re 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.

The Buttermilk 55 features a z-foam back panel and removable frame sheet, shaped to match the curve of your back. Poke the z-foam and you’ll see it springs back. That compression/ reaction motion happens as you hike, pumping air through to keep your back cool. High quality foam provides comfort by distributing pressure evenly and maintaining volume under load.
Manufacturer Boreas
Weight 3 lbs 1 oz
Gender Men's & Unisex
Liters 55L
Material 140D ripstop nylon
Torso Length Range 46-51cm / 18-20" (Medium)
51cm+ / 20"+ (Large)
Other Features Super-light 140D ripstop nylon pack body fabric is impregnated with silicone for waterproof strength that won't wear out or rub off over time. Heavier 420D nylon is used for the bottom.

Applied PU ribcage construction provides lightweight structure

Full-face front stretch-fabric pocket, two stretch-fabric side pockets, two hip belt pockets

Dual daisy chains tuck away when not in use, hidden gear loops on shoulder straps

Hydration compatible

Rain cover included
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Questions and Answers
Boreas Backpack Sizing
Bolinas One Size 47 cm 18.5 in.    
Buttermilk 55 - Men's S/M 46 - 51 cm 18 - 20 in.
M/L >51 cm >20 in.
Buttermilk 55 - Women's S/M 40 - 46 cm 16 - 18 in.    
  M/L 46 - 51 cm 18 - 20 in.    
Larkin One Size 47 cm 18.5 in.
Lost Coast 45 S/M 46 - 51 cm 18 - 20 in.    
  M/L >51 cm >20 in.    
Lost Coast 60 - Men's S/M 46 - 51 cm 18 - 20 in.
M/L >51cm >20 in.
Lost Coast 60 - Women's S/M 40 - 46 cm 16 - 18 in.    
  M/L 46 - 51 cm 18 - 20 in.    
Muir Woods 20 One Size 47 cm 18.5 in.
Muir Woods 30 One Size 47 cm 18.5 in.    
Repack 15 One Size 47 cm 18.5 in.
Valencia One Size 47 cm 18.5 in.    


Backcountry Gear gets it: camping and hiking gear should help get you out into nature while not weighing you down with what it takes to get there. Your outdoor adventure shouldn't be hindered by heavy kitchenware, overwrought backpacks, or complicated camping tents. Get equipped with the right gear, but not too much. It's about efficiency and versatility, minimum weight for maximum benefit. Backcountry Gear, where minimalism meets productivity.

Backcountry Gear knows lightweight backpacking is all about keeping things compact and sensible. Hiking gear should be sturdy, reliable, and lightweight. Camping tents should be constructed of lightweight, durable materials, and be easy to assemble. Kitchen kits should be featherlight and easy to clean. Trekking poles should keep you balanced. Accessories like medical kits should be comprehensive and intuitive. We understand, and we understand not every hiker is the same.

Our inventory has a backpack for every pursuit. We have ultralight daypacks, hydration packs, packs for kids, duffles, and child carriers. No one gets left out. We have dog packs, lumbar packs, dry bags, travel packs and luggage, courier bags, shoulder bags, and external frame backpacks. They’re all engineered by the best in their fields with features that make getting to what you need rapid and simple.

Backcountry Gear has reliable ultralight stoves and titanium cookware to make cooking a cinch and camping a treat. Canister stoves or liquid fuel stoves, we have one right for you. Boil water quickly with Jetboil's Sol and MSR's Reactor, or go ultralight with MSR's Micro Rocket and Primus' Express Stove. Keep weight down with ultralight titanium pots, pans, and utensils from Snow Peak and Evernew and keep going.


For multi-day hikes, Backcountry Gear has go-to water treatment options for every water source. Pump and be sure with MSR's Hyperflow Microfilter or Katadyn's Hiker Pro Microfilter. Or avoid chemicals and pumps altogether with gravity filtration systems from Platypus or UV sterilizers from Steripen.


Headquartered in Eugene, Oregon, Backcountry Gear has the best camping and hiking gear from the global industry leaders Osprey, Western Mountaineering, and Sierra Designs. We stock the best in sleeping bags, lightweight tents, and ultralight backpacks, too. When you plan for the outdoors, plan on, your first stop for outdoor adventure. Every step of the way.