Mountain Equipment Helium 250 down sleeping bag for backpacking/bikepacking tours

Mietprodukt

Ideal for ultralight tours on mild nights

Are you planning a multi-day backpacking trip or a bikepacking adventure and looking for a lightweight yet reliable summer sleeping bag? Then you'll definitely want to consider the Helium 250 from Mountain Equipment. This down sleeping bag offers the perfect combination of comfort, weight, and pack size – ideal for warm nights outdoors, whether on a trekking tour, in a tent, or while fastpacking.

Uncompromisingly lightweight – for everyone who counts every gram.

Weighing just 660g in size Regular, this summer sleeping bag is a true featherweight. Its tiny pack size of 19 x 17 x 15 cm makes it the ideal companion for minimalists, cycle tourists, and ultralight enthusiasts. Whether in a pannier, bikepacking roll, or trekking backpack – this sleeping bag fits easily into any luggage configuration.

Sustainable materials, high sleeping comfort

For those who value sustainability, the Helium 250 scores points with its completely recycled outer and inner materials. The shell, made of 100% recycled Helium 20D, is not only exceptionally lightweight and breathable, but also PFC-free. Inside, recycled Supersoft 20D ensures a soft feel against the skin. The filling consists of 261g of high-quality duck down with a fill power of at least 700 cuin – a 90/10 down blend is included.

Designed for restful nights at moderate temperatures

The Alpine Fit 2.0 offers a close-fitting cut that keeps warmth where you need it – without restricting your movement. Angled box baffles prevent cold spots, while the 5-chamber hood and anatomically shaped footbox provide added comfort. A thoughtfully designed thermal collar with the Lode Lock closure and the Gemini zip system reliably trap warmth when the temperature drops towards morning.

Temperature ranges according to the manufacturer

The "Good Night's Sleep" rating for a Mountain Equipment sleeping bag is a manufacturer's recommendation – based on practical tests and experience – and complements the official EN 13537/ISO 23537 standard (T-Comf, T-Limit, T-Extreme).

What does this information mean exactly?
"Good Night's Sleep Temperature" = Temperature at which you can sleep comfortably without feeling cold – even with prolonged use or under real-world conditions such as:
✅ lightweight sleepwear
✅ thin sleeping mat
✅ possibly damp weather
✅ Fatigue or hypothermia due to daily stages

✅ T-Comf: 10 °C (our recommendation for comfortable sleep is 7–10 °C)
✅ Temperature limit: 5 °C (limit for experienced sleepers)
✅ T-Extreme: -9 °C (emergency range, not intended as a comfort zone)

Note on temperature perception:
The temperature ratings are provided by the manufacturer and are standardized. In practice, however, they can vary – especially if you are exhausted, hungry, or wet. The quality of your sleeping mat also has a significant impact, as down compresses at the back and therefore provides less insulation. A good sleeping mat is therefore essential for a warm night.

All important features at a glance

✅ Weight: only 660 g (size Regular)
✅ Packed dimensions: 19 x 17 x 15 cm
✅ Filling quantity: 261 g duck down (90/10, min. 700 cuin)
✅ Outer material: 100% recycled Helium 20D, breathable, PFC-free
✅ Inner material: 100% recycled supersoft 20D
✅ Alpine Fit 2.0 (close-fitting)
✅ 5-chamber hood and 4-chamber foot section
✅ Thermal collar with Lode Lock closure
✅ 140 cm zipper with Gemini system
✅ Waterproof compression pack sack with roll-top closure
✅ Breathable storage bag for home use

Made for summer – and for everyone who wants to stay flexible

This down sleeping bag is perfect for you if you want to travel light, fast, and flexibly – whether bikepacking, hiking the GR20, or on your next hut-to-hut adventure. And the best part: you don't have to decide right away. With us, you can test the Mountain Equipment Helium 250 first – and then decide if you want to keep it.

Test the summer sleeping bag in real-world conditions before you buy it. Rent your outdoor gear directly online – or conveniently borrow your outdoor equipment as a package for your next microadventure.

Outdoor equipment for your adventure:
Tent | Sleeping bags | Sleeping mats | Backpacks | Outdoor clothing | Mountaineering equipment