Boreas Buttermilks 40 Pack

Priced: $122.93 - $164.99 Rated:   - 5 stars out of 5 by 1 review.
Boreas Buttermilks 40 Pack
Zoom In
Color: Marina Blue
Available Colors:
REI $122.93
25% off
Regularly: $165.00 $123.71
25% off
Regularly: $164.95 $131.96
20% off
Regularly: $164.97
Gearx $164.95 $164.95
Mountain Gear $164.99
Visit our Daily Deals for great products at low prices.
Boreas Buttermilks 40 Pack -
The Boreas Buttermilks 40 backpack is simple, straightforward and light on your back.
Buttermilks are light and uncomplicated. They're designed for those who want to move really fast and those who think it's just plain crazy to carry heavy things around in the woods.
Tough Stuff: Boreas Gear's 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. 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, like it is in this Boreas pack.
Keep it Clean: There was a time when packs were judged by how many zippers, buckles and straps they had. Thankfully, those days are over so we can benefit from better ideas like daisy chains that tuck away when you don't need them.
From overnight jaunts to lightweight multi-day thru-hikes, or even lugging your climbing gear on the approach, this 40-liter Boreas backpack is a versatile performer.


  • Pack body made from 210D silicone-impregnated ripstop nylon; heavier 420D nylon on the pack bottom


  • Fits torso lengths of 46-51cm / 18-20"


  • Full-length front stretch pocket, 2 side stretch pockets and 2 hipbelt pockets let you organize and easily access gear, clothing, water bottles and snacks
  • Light, no-nonsense hipbelt and shoulder straps with sternum strap are sized for a woman and made with resilient foam that keeps its volume and helps distribute pressure evenly


  • The Boreas Buttermilks 40 pack features tuck-away daisy chains, raincover, hidden gear loops on the shoulder straps and hydration compatability (reservoir sold separately)


  • Simple, zigzag foam back panel and removable framesheet are shaped to match the curve of your back and pump fresh air through the channels as you walk
  • Clean, uncluttered pack body features a lightweight polyurethane rib cage design that adds structure
  • BACKPACKER 2012 Editors’ Choice Award winner! The April issue states, “Get everything you need and nothing you don’t in one of these ultralight, ultracomfortable packs.”
  • Simple Clean design with daisy chains that tuck away when you don’t need them
  • Minimum weight of 1,045g / 2lbs 5 oz
  • Compressing foam allows air to flow across your back as you move
  • Stock weight of 1,365g / 3 lbs
The Buttermilk 40 Backpack by Boreas is the perfect pack for the uncomplicated hiker who just wants to hit the trail and go. Designed specifically for those who want to move quickly and think carrying all that heavy stuff is just ridiculous. The Boreas Buttermilk 40 Backpack holds up to 56L of gear and is constructed with a 140D ripstop nylon body that has been coated with silicone to keep things dry, and a 420D nylon bottom end for durability. This uncomplicated backpack has a Z-foam back panel to keep you cool and a removable frame sheet both are shaped to fit the curve of your back. The foam belt keeps things comfy when under load.


Smart. Simple. Striking. The Boreas Buttermilks 40 looks quite unlike any other multi-day pack in our inventory, but its dare-to-be-different attitude is not merely a cry for attention. At its heart, the Buttermilks is really just an uncomplicated, easy-to-use 40-liter roll-top pack with some clever design touches, such as hide-away daisy chains and silicone-impregnated nylon fabric that sheds water. The Z-foam back panel is intended to act like a bellows, forcing air in and out you expand and contract it with your motions, and the hipbelt pockets are generously sized for snacks, point-and-shoot cameras, and small binoculars.

Feature list from Boreas:


Volume: 40L / 2,136in3




The Boreas Buttermilks 40 pack offers women an ultralight solution for fast-moving, overnight adventures. If you think it's crazy to lug heavy things around the woods, this may be the pack for you!


Mountain Gear
From the start, Boreas has been dedicated to simple, effective design and the Buttermilks 40 Women's Backpack makes that quite evident with its no-frills approach to the backcountry.
Want it cheaper? Set your own price.
Enter the price you want to pay and we'll email or text you if we find a store that will sell it for that amount:
Price: $
Your email:
Cell number: (optional, for text message)
Learn how offers work...
Average Price History: Price History
Review RatingNumber of Reviews
Adjustable Torso Length:No
Adjustable torso:No / No
Backpack Features:Top Loader
Backpack Style:Multi-Day Pack
Backpanel:z-foam back panel
Body Material:140D Ripstop Nylon
Capacity:2136 cu in / 40 L
Color(s):Farallon Black, Marina Blue, Golden Gate Red
Detachable Pack:no
Fits torso:16 - 18 / 18 - 20 inches
Fits waist/hips:Up to 32 / More than 32 inches
Frame:Removable frame sheet
Frame material:Removable HDPE framesheet/aluminum frame hoop
Frame type:Internal
Gear capacity (L):40 / 40 liters
Gear capacity (cu. in.):2,136 / 2,136 cubic inches
Helmet Carrier:no
Hydration Bladder Included:Not Included
Hydration Compatible:Yes
Ice Axe Loops:no
Laptop Sleeve:None
Large Torso Length:>51 cm / >20 inches
Large Weight (min.):1,050 g / 2 lbs 5 oz
Large Weight (stock):1,370 g / 3 lbs
Material:Silicone coated super-light 140D ripstop nylon
Medium Torso Length:46-51 cm / 18-20 inches
Medium Weight (min.):1,045 g / 2 lbs 5 oz
Medium Weight (stock):1,365 g / 3 lbs
Number of Pockets:6
Number of exterior pockets:6 + main compartment
Number of stays:0
Organization Pocket:yes
Pack Size:2000-2999 cu in
Pack access:Top
Pack loading:Top
Primary Access:Top Access
Raincover included:Yes
Shovel Pocket:no
Ski / Snowboard Carrier:no
Sleeping Bag Compartment:no
Suspended mesh back panel:No
Torso:16 - 18 in / 40 - 46 cm (M); 18 - 20 in / 46 - 51cm (L)
Torso Size:46-51cm / 18-20" (mens),
Trekking Pole Loops:no
Volume:40 liters / 2,136 cubic inches
Weight:3 lb / 1365 g (M); 3 lb 1 oz / 1370 g (L)
Weight - metric:1.36 / 1.37 kilograms
Compare specifications to related products.

Similar Products:

Boreas Buttermilks 40 PackBoreas Buttermilks 40 Pack$114.73 - $164.95
Boreas Buttermilk 40 Internal Frame BackpackBoreas Buttermilk 40 Internal Frame Backpack$114.95

Subcategories of Backpacks, Daypacks & Bags:

Boreas Buttermilks 40 Pack Review:


Wow! Fantastic!

I was blown away by the quality of design in this pack. I have the Men's Buttermilks 40, not the women's, but I like this pack enough to want to spread the word.

The pack construction is rock solid, with stretch fabric in place of mesh on the side and front pockets, quality zipper pulls throughout, reinforced seams, and flawless ergonomics. The pack was immediately comfortable with 20lbs of camping gear.

I walked around extensively and the foam backpanel kept me cooled off, and was much more comfortable than my previous backpack (a Kelty Red Cloud).

This pack is fantastic if:

-Your gear is very lightweight and compressible
-Your needs as a backpacker do not include organization

Consider packing in this like a stuff sack. The hip pockets and front zipper pocket held my phone, first aid, and most of my essentials like matches and duct tape. The large interior compartment held everything in my sleeping kit with room for about 4-6 days worth of high calories-to-weight ratio food, maybe a bit more at a stretch. If I was going to thru-hike, the 40L pack would be just barely within my capacity level.

Final notes:

The bungee cords pictured on the front are easily removed and replaced anywhere. The two greenish stripes running vertically along the pack contain webbing lashes that you can tie gear to, and I put both bungees on one vertical strip so I can use them to strap my hiking poles on. The pole bottoms can rest in the ice axe loop.

The pack easily accommodated my 3L Camelbak bladder with hose.

The included pack cover was light enough that I'd probably take it with me despite knowing that internal pack waterproofing is better, like a dry-sack.
Max the Backpacker at REI on 11/11/2012