Western Mountaineering Alpinlite 20 Degree

Welcome to Western Mountaineering sleeping bags — simply some of the best backpacking bags made.

If you’re planning a thru-hike, hiking the John Muir Trail (JMT), or heading out for backpacking, fishing, or hunting trips, the Western Mountaineering AlpinLite 20 is a standout choice. When Western Mountaineering says a bag is rated to 20°F, they mean it. Compare the loft next to many other “20-degree” bags and you’ll immediately see the difference.

The full down collar helps seal in warmth around your neck without unnecessary bulk, while 16 oz. of premium high-loft down gives the UltraLite an impressive 5 inches of loft. Even with that warmth, it packs down small and weighs just 1 lb. 13 oz.

Another reason we love Western Mountaineering: they’re a small business like ours, run by people who genuinely care about the outdoors and making exceptional gear.

Looking for more room? The Western Mountaineering AlpinLite 20 has become one of our most popular sleeping bags for a reason. It offers the same legendary warmth and build quality as the UltraLite, but with a wider fit for added comfort. With a full-length YKK zipper, 3D down collar, and generous loft, it’s one of the best 20-degree down mummy bags available for hikers who don’t want to feel restricted.

At Eastside Sports, we know trail gear because we’ve lived it. Our shop is owned and operated by former (for now) thru-hikers, including 2015 PCT southbounders. Past staff members hiked the PCT in the 1970s and 1980s, and other team members have worked as backcountry rangers in multiple national parks.

We carry gear we trust, use, and recommend for real days in the mountains.

Features

• Full Down Collar
• 5″ Loft, 20° F
• 5 1/4″ Spacing/Continuous Baffles
• 19 oz. Down Fill
• 64″/39″ Shoulder/Foot Girth
• Full-length #5 YKK Zipper
• 1 lb. 15 oz. Total Weight

TECH SPECS