Buffalo Park 40°

Synthetic fill Big Agnes System bags geared for the big guys or those who want more space

The Big Agnes System

When insulation material is compressed under your body, it loses most of its ability to insulate. We eliminate the unnecessary bottom insulation and replace it with one of two pad sleeve designs to accommodate the pad which provides the insulation. This design provides a secure foundation and keeps you on the pad all night.

Specs + Sizing

Bag Weight2lb 15oz / 1.33kg
Fill Weight21oz / 595g
Compressed Bag Size8in x 10in / 20 x 25cm
Stuff Sack SizeM 8in x 17.5in / M 20 x 45cm
Shoulder Girth80.5in / 204cm
Hip Girth75in / 190cm
Foot Girth66in / 168cm


Park bags' unique quilt-like construction turns your bag into a backcountry bed

Wrap the top of the bag around your shoulders like you do with your comforter at home

Super durable lightweight shell and cozy cotton liner

Stretch fabric panels on the side of the pad sleeve accommodate different pad thicknesses

Mate together left and right zip bags

Interior fabric loops for sleeping bag liners

Exterior loops for hang drying or storage

Nylon stuff sack

Construction + Materials

Nylon taffeta shell fabric with water repellent finish

Cotton/Polyester lining

Thermolite® Extra - a simulated down material that offers plush warmth and softness

 Rectangular shaped bag

Integrated full pad sleeve 
Double zippers allow entry from either side of bag and when unzipped allows top of bag to be used like a comforter

2 x 62/157cm YKK #8 zipper

Here’s what other people think.

What’s in a Name?

Buffalo Park sits almost 10,000 feet above sea level on the rugged Rabbit Ears Pass. For centuries buffalo would summer here. The Ute Indians used this area as hunting, spiritual and burial grounds.