Klymit UltraLite Sleeping Bag

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Western Mountaineering down gear has an awesome reputation in the US and that reputation is beginning to build on this side of the pond. Very high quality materials design and construction results in the lightest bags available for a given warmth.

Western Mountaineering says:

If your summer bike tour is going to take you through different climates then the UltraLite is a good choice. With a 59` shoulder girth this efficient bag is good to -7°C. The full down collar helps to seal in heat around your neck without adding excess bulk and 455g of high lofting down pumps this bag to 5″. The total weight of this very compressible package is only 820g.

Our Verdict

Western Mountaineering down gear has an awesome reputation in the US and that reputation is beginning to build on this side of the pond. Very high quality materials design and construction results in the lightest bags available for a given warmth.  

An example of their attention to detail is their quoted 850+ fill power down used in all their bags: WM quote this figure even though their down generally gets higher ratings in official tests this is because they feel that the official pre-testing preparation enhances the down quality!

– Reviewed by Ultralight Outdoor Gear

Features

• Full-length #5 YKK Zipper
• Full Down Collar
• 5 1/4″ Spacing/Continuous Baffles
• 59″/38″ Shoulder/Foot Girth
• 5″ Loft, 20° F
• 16 oz. Down Fill

Specifications

• Shape: Mummy (w/ full collar)
• Rating: -7°C / 20° F *
• Loft: 14cm / 5.5″
• Highest Quality minimum 850+ fill power down

Short

• Length: 165cm / 5’6″
• Weight: 768g
• Fill weight: 425g
• Packed size: 33 x 18cm
• Internal shoulder girth: 150m / 59″
• Internal hip girth: 130cm / 51″
• Internal foot girth: 97cm / 38″
• Full Length Baffled YKK Zipper

Regular

• Length: 180cm / 6″
• Weight: 838g
• Fill weight: 455g
• Packed size: 33 x 18cm
• Internal shoulder girth: 150m / 59″
• Internal hip girth: 130cm / 51″
• Internal foot girth: 97cm / 38″
• Full Length Baffled YKK Zipper

Long

• Length: 200cm / 6’6″
• Weight: 902g
• Fill weight: 480g
• Packed size: 33 x 18cm
• Internal shoulder girth: 152m / 60″
• Internal hip girth: 132cm / 52″
• Internal foot girth: 97cm / 38″

* Western Mountaineering state: ‘We independently verify own temperature ratings through our own testing, customer feedback and design knowledge. Most of the items in our catalog we have been making for years, which means we have lots of prior knowledge from everyday consumers on what ratings are accurate. We have also EN tested our bags. In every case the EN rating is lower than our posted rating. This means our ratings are more conservative. We do this to ensure that almost everyone will be happy in our bags at the temperature we publish.’

More About Western Mountaineering:

• Western Mountaineering Construction
• Western Mountaineering Materials

Help and advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• The EN13537 Standard
• All About Down