Sierra Designs Sleeping Bag from $140 to $509, from Amazon.com

With a lightweight design, a temperature rating of 15 degrees Fahrenheit and an array of features, it's easy to see why the Nitro 15 Degree Long down sleeping bag has been a perennial best-seller i... more

With a lightweight design, a temperature rating of 15 degrees Fahrenheit and an array of features, it's easy to see why the Nitro 15 Degree Long down sleeping bag has been a perennial best-seller in the Ultralight Series by Sierra Designs. less

The Solar Flare from Sierra Designs is probably suited to the greatest variety of climates and pursuits for women. Rated to 15 degrees, but with a two way Snag Free zipper to allow comfortable ven... more

The Solar Flare from Sierra Designs is probably suited to the greatest variety of climates and pursuits for women. Rated to 15 degrees, but with a two way Snag Free zipper to allow comfortable venting, the Solar Flare redefines a girl's best friend. less

The Solar Flare from Sierra Designs is probably suited to the greatest variety of climates and pursuits for women. Rated to 15 degrees, but with a two way Snag Free zipper to allow comfortable ven... more

The Solar Flare from Sierra Designs is probably suited to the greatest variety of climates and pursuits for women. Rated to 15 degrees, but with a two way Snag Free zipper to allow comfortable venting, the Solar Flare redefines a girl's best friend. less

Sierra Designs wrapped the Men's Trade Wind 30-Degree Down Sleeping Bag with a waterproof breathable DriZone shell to keep the insulation dry even during an open bivy. The 600-fill down insulation'... more

Sierra Designs wrapped the Men's Trade Wind 30-Degree Down Sleeping Bag with a waterproof breathable DriZone shell to keep the insulation dry even during an open bivy. The 600-fill down insulation's excellent warmth-to-weigh­t ratio shaves ounces from your pack, and it also helps the Trade Wind Sleeping Bag pack incredibly small to save precious cargo space. Whether you're going on a long-distance hike or want a bag that can handle a night in a snow cave, give this Sierra Designs bag a try. Yo... less

With a lightweight design, a temperature rating of 15 degrees Fahrenheit and an array of features, it's easy to see why the Nitro 15 Degree Long down sleeping bag has been a perennial best-seller i... more

With a lightweight design, a temperature rating of 15 degrees Fahrenheit and an array of features, it's easy to see why the Nitro 15 Degree Long down sleeping bag has been a perennial best-seller in the Ultralight Series by Sierra Designs. less

Sierra Designs couldn't have given the Men's Wicked Light 45 Degree Down Sleeping Bag a more appropriate name--it barely tips the scales with a 22oz weight. This isn't some feature-strippe­d bag. Si... more

Sierra Designs couldn't have given the Men's Wicked Light 45 Degree Down Sleeping Bag a more appropriate name--it barely tips the scales with a 22oz weight. This isn't some feature-strippe­d bag. Sierra Designs added a full-length zipper for ease of use and draw cord around the collar to keep out the cold air. The Wicked Light Sleeping Bag's lofty 800-fill down insulation provides incredible warmth for its weight, so you don't have to choose between a warm night and a light pack. less

You won't believe how much warmth you get from such a small package - the Nitro packs into a tiny sack (included), but stays toasty to 15 degrees. Continuous baffling and a draft tube contain 800-f... more

You won't believe how much warmth you get from such a small package - the Nitro packs into a tiny sack (included), but stays toasty to 15 degrees. Continuous baffling and a draft tube contain 800-fill goose down, the warmest, lightest insulation available. Cinch down the Jacket Hood and see how intelligent design, in conjunction with the best materials, makes a superior piece of gear. Removable Pad Locks keep you atop your sleeping pad, while Foot Box Venting dials the internal environment of... less

Flex is back! Thermally efficient and comfortable, it is designed into the mid portion of the bag, where you move most. PrimaLoft Eco offers superior synthetic insulation, with an earth friendly tw... more

Flex is back! Thermally efficient and comfortable, it is designed into the mid portion of the bag, where you move most. PrimaLoft Eco offers superior synthetic insulation, with an earth friendly twist. Made of recycled plastic and soda bottles, it is durable, lightweight and weather resistant. The Jacket Hood guarantees warmth down to 30 degrees and Foot Box Venting for regulates temperature. less

Sierra Designs was founded by George Marks and Bob Swanson in 1965 in Richmond, CA. They wanted to design outdoor equipment that would enhance your experience in the rugged outdoors. Sierra Designs... more

Sierra Designs was founded by George Marks and Bob Swanson in 1965 in Richmond, CA. They wanted to design outdoor equipment that would enhance your experience in the rugged outdoors. Sierra Designs products have been tested as they've traveled to the highest peaks, held up in 230 mph winds, and withstood unbearable downpours. Sierra Designs moved to Emeryville, California, in 1994. Today, they have several partners worldwide and in the USA you can find them in Louisville, CO with warranty and... less

800 fill goose down Flex technology is designed in the mid-portion of the bag where you need it most for moving around -eliminates constriction, allowing the bag to move with you, keeping you warm ... more

800 fill goose down Flex technology is designed in the mid-portion of the bag where you need it most for moving around -eliminates constriction, allowing the bag to move with you, keeping you warm and comfortable Fitted Jacket Hood provides better insulation with less weight, and draft tube along zipper insulates against cold spots Foot box vent opens for ventilation Snag-Free Zipper Tracks, Removable Pad Locks, 1/2 Zipper for reduced weight less