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Delivering enough warmth for ultra-light cool-weather climbs and backcountry excursions, the Marmot Hydrogen 30 Degree Sleeping Bag still weighs in at a wispy one pound for light and fast climbs and hikes.

Voted Best All-Around Summer Bag- Backpacker Magazine's Gear of the Year Awards 2009Going Ultralight doesn't have to mean suffering, because we never skimp on our lightweight bags. We'd rather find a way to shave the weight and innovate on performance, like using Flex technology for our Nitro 30. We build in Flex between the shoulders and knees, so you get the comfort and thermal benefits, while saving precious ounces. Our smart Foot Box Venting lets you customize the climate in the lower half of your Nitro, without adding the weight of a full-length zipper. Ultralight speed with full-featured comfort.

The Kelty Supernova 30 3-in-1 Degree Sleeping Bag offers space for two and multi-function benefits. A deep hood, pillow pockets, silky shell fabric, and an external storage pockets are just the beginning!

The ultra-light Marmot Arroyo 30 Degree Sleeping Bag has just enough high quality down to make it warm enough for alpine bivvies and lightweight camping trips in temps dipping below freezing.

Lighten up so you'll be the one singing the last mile into camp. The Spark doesn't compromise comfort or warmth to shave ounces. We use partial Flex construction to keep the luxury meter pegged without adding noticeable weight. You'll sleep more comfortably, and more warmly, than ever before with Flex. Just to prove we're still attached to the details, we include all the bells and whistles, like Foot Box Venting, to make our Ultralight Spark as comfortable as bags weighing twice as much.

Lighten up so you'll be the one singing the last mile into camp. The Spark doesn't compromise comfort or warmth to shave ounces. We use partial Flex construction to keep the luxury meter pegged without adding noticeable weight. You'll sleep more comfortably, and more warmly, than ever before with Flex. Just to prove we're still attached to the details, we include all the bells and whistles, like Foot Box Venting, to make our Ultralight Spark as comfortable as bags weighing twice as much.

Thermally efficient and comfortable, Flex™ is designed into the mid portion of the Sierra Designs Lazer 30 Degree Sleeping Bag, right where you need it the most. PrimaLoft® Eco synthetic insulation continues to maintian its insulating properties even when damp, just in case you didn't anticipate buckets of morning dew. Made of recycled plastic and soda bottles; the Sierra Designs Lazer 30 Degree Sleeping Bag is durable, lightweight and weather resistant. The Jacket Hood guarantees warmth down to 30 degrees and the Foot Box Venting allows you to adapt to changing climates by regulating the bag's temperature.

A nights rest should be saw awesome as your camping adventure the Sierra Design Arrow Rock 30 Degree 600 Fill Sleeping Bag delivers soft comfort in lightweight 600-fill goose down. This Sierra Design 3-season sleeping bag wars down to 30 degrees Fahrenheit.

With Flex technology throughout, the Sierra Designs Women's Diamond Spring 30 Degree Sleeping Bag ensutres a great night's rest, allowing you to spoon, sprawl, or starfish until the sun comes up. Warm yourself with 600-series down, legendary for its thermal efficiency, light weight, and durable compressibility. The Diamond Spring 30 is about as good as it gets for cool climates, three seasons of the year.

A good night's rest means having a clear conscience, too. Sleep easy with PrimaLoft Eco recycled insulation in your Flare 30. Made from post-consumer recycled polyester, PrimaLoft acts like down for warmth, but retains its insulating properties when wet. We've adapted our Flex construction to Ultralight bags, using expandable-baffle Flex from the shoulder to the knees for comfort, without adding significant weight.

The North Face Gold Kazoo is a thirty-degree down bag that weighs less than a liter of vodka.

At sub-two pounds, the Marmot Never Winter 30 Degree Sleeping Bag is an ideal summer bag for camping and river trips, but it also has enough down insulation to keep you warm when frost is in the air.