Big Agnes Yampa 45 Degree Sleeping Bag

With its water-repellent DownTek insulation and a roomy semi-rectangular shape, the Big Agnes Yampa 45 Degree sleeping bag is designed for warm-weather backpacking but can also be used as a liner or an overbag in extreme cold.

The bag is insulated with 650-fill DownTek insulation. Down insulation has long been renowned for its compressible properties and efficiency in delivering an excellent warmth-to-weight ratio. The shortcoming of down has been its susceptibility to the effects of moisture, losing much of its performance qualities when wet or damp. DownTek insulation utilizes nano technology and a proprietary application process to provide water-repellency and both anti-microbial and anti-bacterial protection. A polyester microfiber rip-stop shell also features a water repellent treatment and provides lightweight durability. A quilted design eliminates cold spots and offer consistent heat distribution.

In a traditional sleeping system, the bag lies on top of a sleeping pad. In this configuration, many people find themselves rolling off the pad at night. Plus, the insulation on the bottom of the bag is compressed by the sleeper's weight. Once compressed, the fill loses most of its insulating properties. The Big Agnes Sleep System is different, joining the bag and pad together. The pad slides into a sleeve on the bottom side of the bag, supplying insulation to the otherwise uninsulated bottom of the bag while the top and sides of the bag are insulated like a traditional sleeping bag. This design provides a secure foundation so you can roll, twist and turn freely during the night without ever rolling off your pad. It also prevents the bag from twisting and engulfing you in an uncomfortable mess.

The Yampa 45 Degree is available in Regular (fits up to 5' 10") and Long (6' 6") lengths. Once you match your bag with a rectangular sleeping pad of the appropriate dimensions (20" x 72" for Regular or 20" x 78" for Long), spending a night in the bag is both warm and comfortable. Note that the pad is sold separately.

A nylon stuff sack and mesh storage sack are included with each Big Agnes Yampa 45 Degree sleeping bag.