Ultralight Sleeping Bags

Maximum warmth for minimal weight, the ultralight down sleeping bag is the perfect companion for long treks and fast-paced hikes. Compressing down to almost nothing, it keeps your nights warm without weighing down your backpack. Here's how to choose the right one for you.

A sleeping bag built for lightness

The ultralight down sleeping bag aims for the best warmth-to-weight ratio. Thanks to its down filling, it keeps you warm effectively while staying very light on the scales and packing down into a tiny volume. It's the choice of long-distance trekkers and fast-and-light hikers alike, who count every gram on their back.

Warmth, temperatures and comfort

Choose your warmth level according to the season: a lightweight model for summer nights, something a little warmer for cooler mid-season trips. A mummy shape retains heat better than a roomier cut. Good-quality down lofts well and wraps around the body; pair it with an insulating sleeping pad, as the ground remains the biggest thief of heat at night.

A compact, lightweight sleeping bag

Ultra-compressible, the ultralight bag disappears into the bottom of a trekking backpack without taking up space. Down hates moisture: store it dry in a waterproof stuff sack and unpack it on arrival so it regains its full loft. For more versatile options, take a look at our down sleeping bags.

Caring for your down

A well cared for down bag lasts for years: store it unpacked (not compressed) at home, air it out after every trip, and wash it rarely, using a specialist down detergent. These simple habits preserve its loft, and therefore its warmth, night after night.

To complete your kit: our microfiber towels for hiking.

Frequently Asked Questions

What weight should you look for in an ultralight sleeping bag?

Depending on the warmth rating, an ultralight sleeping bag typically weighs between 500g and 1kg. Down offers the best warmth-to-weight ratio and compresses right down, making it ideal for long treks where every gramme counts.

Down or synthetic fill for an ultralight sleeping bag?

Down is warmer, lighter and more compressible — perfect for dry conditions. Synthetic handles damp better but weighs more. For ultralight trekking in dry conditions, down remains the benchmark.

Does an ultralight sleeping bag keep you warm?

Yes, match it to the season you're heading out in: choose the comfort temperature based on your nights (summer or three-season). Always pair it with an insulating sleeping mat, since cold comes mainly from the ground - otherwise your sleeping bag's warmth won't be enough on its own.

How to care for a down sleeping bag?

Store it uncompressed and fully lofted, air it out after use, keep it dry when you're out and about, and wash it rarely with a suitable product. This helps the down keep its loft, which is the key to lasting warmth.

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