Big Agnes Yampa 40 Degree (2008) Sleeping Bag

Product Highlights

Updated for 2008! With its high-performance goose down fill and a roomy semi-rectangular shape, the Big Agnes Yampa 40 Degree sleeping bag is an ideal choice for backpacking and camping in late Spring, Summer, early Fall or warm climates.

The Yampa 40 Degree is insulated with 650 fill goose down. Renowned for their compressible properties and efficiency in providing insulation, the feathers and fibers of down have an incredibly soft, comfortable feel and, despite advances in synthetic materials, continue to provide the best warmth-to-weight ratio of any insulation available. Though down fill is susceptible to the effects of moisture, losing much of its performance qualities when damp or wet, the nylon microfiber rip-stop shell fabric of the Yampa 40 Degree does have a surface treatment that helps to repel water.

Offering versatility, the Yampa 40 Degree also works well as an overbag, adding approximately 25 degrees to the temperature rating of your primary sleeping bag. Applying the concept of layering to sleeping bags, you can combine a sleeping pad, most any sleeping bag and the Big Agnes Yampa 40 Degree as an overbag to create a versatile year-round system that you can pick from based on trip and temperature needs.

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 bottom of the bag while the top 2/3 of the bag is 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. Big Agnes uses this system throughout their entire line of sleeping bags.

The Yampa 40 Degree is available in Reg (fits up to 5'10") and Long (fits up to 6'6") lengths. Once you match your bag with a rectangular sleeping pad of the appropriate dimensions (20" x 72" for Reg and 20" x 78" for Long), spending a night in the Yampa 40 Degree is both warm and comfortable. A built-in pillow pocket holds clothes or a Big Agnes Air Core Pillow (sold separately), providing a comfortable resting place for your head and neck.

your convenience, the Big Agnes Yampa 40 Degree is available in your choice of Right and Left zippers. A nylon stuff sack and cotton storage sack are included with each Yampa 40 Degree.