Ultralight Sleeping Bags

Engineered for those who prioritize weight and packability, our ultralight sleeping bags ensure you travel light while staying warm. Perfect for backpacking and minimalist camping, experience the ultimate in performance and convenience

Full-length zip (-9°C & -18°C)
0°F / Regular || Spark Down Sleeping Bag

Spark Down Sleeping Bag (-18°C - 7°C)

$599.00-$1,399.00
Relaxed Mummy: thermal efficiency & room for side sleepers
15°F / Regular || Ascent Down Sleeping Bag

Ascent Down Sleeping Bag (-9°C & -1°C)

$599.00-$729.00
Spark Pro Down Sleeping Bag (-9°C & -1°C)
15°F/ Regular || Spark Pro Down Sleeping Bag

Spark Pro Down Sleeping Bag (-9°C & -1°C)

$799.00-$929.00
Spark Women's Down Sleeping Bag (-9°C - 7°C)
15°F/ Regular || Spark Women's Down Sleeping Bag

Spark Women's Down Sleeping Bag (-9°C - 7°C)

$599.00-$829.00
Ascent Women's Down Sleeping Bag (-9°C & -1°C)
15°F / Regular || Ascent Women's Down Sleeping Bag

Ascent Women's Down Sleeping Bag (-9°C & -1°C)

$599.00-$729.00
Traveller Down Sleeping Bag (7°C)
45°F / Regular || Tanami Down Comforter

Traveller Down Sleeping Bag (7°C)

$269.00-$299.00

Ultralight Sleeping Bag DesignPeak Performance

Embark on your next adventure with confidence, equipped with Sea to Summit's ultralight sleeping bags. Expertly engineered for those who prioritize weight and packability without sacrificing warmth and comfort, our ultralight sleeping bags are the perfect companion for any minimalist adventurer. Whether you're thru-hiking, bikepacking, or fast-packing, our sleeping bags provide the ideal balance of performance and convenience.

Our sleeping bags are meticulously designed to deliver maximum warmth with minimal weight. Utilizing advanced materials like high-loft, RDS-certified down and premium synthetic fills, our sleeping bags ensure optimal insulation in a lightweight package. Features such as tapered profiles, ultralight zippers, and strategic baffling work together to reduce weight while maintaining superior thermal efficiency, allowing you to travel further and faster.

Frequently Asked questions

What is a good/acceptable weight for an ultralight sleeping bag?

For summer-early autumn use, 1lb 2oz / 500g is a reasonable maximum. Even at this weight, a bag will have less ventilation / fewer warmth-retaining features - going lower than this will often mean a narrower (less comfortable) shape and more fragile materials.

What temperature ratings are available in ultralight sleeping bags?

Taking 1lb 2oz as an ‘ultralight’ maximum, the lower limit will be around 30°F / 0°C. This requires costly high-loft down, lightweight materials and complex construction. Extend the weight limit to 1lb 10oz / 750g (keeping the high-end materials and construction), and 20°F / -7°C is possible.

Are all ultralight sleeping bags made with down? Are there synthetic/vegan ultralight sleeping bag options?

Synthetic insulation does not insulate as well as down (so more fill is needed to achieve the same temperature). Also, the market for synthetic sleeping bags is price point driven, and ultralight bags need more complex (more expensive) construction – so there are very few truly lightweight synthetic options beyond summer-only bags.

What's the best way to pack/attach a sleeping bag for backpacking?

We would not recommend attaching a sleeping bag to the outside of a backpack - it could be damaged by sharp branches/soaked by rain. A compression sack reduces the packed volume of a sleeping bag, but if the bag is still too bulky, replacing it with a more compact bag is the best option.