The versatile standard for mid-season hiking
The Black Snow down sleeping bag is designed for hikers who refuse to carry multiple pieces of equipment depending on the season. With a comfort temperature at the freezing point, it offers the necessary thermal safety margin to face chilly nights from spring through autumn bivouacs. It is a pragmatic 3-season sleeping bag, whose weight of just over 1 kilo is justified by the high density of its filling, ensuring constant warmth even when the fatigue of hiking sets in.
Heat retention and ripstop shell
Injecting 700 grams of 800-fill goose down into a snug mummy fit limits dead air space inside the sleeping bag. The anatomical footbox prevents the down from compressing around the toes. The 20D ripstop nylon exterior handles the wear and tear of tent life well and features an effective water-repellent treatment against nighttime condensation.
Fitted mummy shape: limiting dead air space throughout a trek
The tapered mummy shape reduces the volume of air to be heated by the body, a principle particularly useful for a trekking sleeping bag where the energy available at the end of a day's hike is limited.
Water-repellent finish: protection designed for nights under canvas
The water-repellent finish on the ripstop nylon protects the insulation from the condensation that regularly forms on tent walls during a bivouac sleeping bag trip of several consecutive nights.
For hikers looking for that same 0°C temperature rating but who feel too confined in a strict mummy cut, the hybrid design of the Naturehike CW700 will offer significantly greater freedom of movement.
Why pay more for the same performance?
The Blacksnow was compared with the Decathlon Forclaz MT900. The finding is simple: you get equivalent technical features and warmth without paying the brand premium. Keep your budget for your next expedition.
Data checked against the brands' official product pages — subject to change.
Doubt about which bag is right for you?
The field guide helps you choose based on skill level, temperature, needs, and weight. Support answers specific questions.
Find my bag Contact supportFrequently Asked Questions
The Blacksnow has a comfort temperature of 0°C and a lower limit temperature of -5°C. These values apply under standard conditions: sleeper in thermal base layers, on an insulated sleeping mat. It is designed for hiking, bivouacking use (3 seasons).
The Blacksnow is filled with 800 cuin. The Blacksnow weighs 1150 g, which places it in the lightweight category.
For multi-day trekking, the main criterion is weight: aim for under 1 kg, ideally between 600 g and 900 g. A high-loft down bag (700 cuin minimum) makes this possible while keeping enough insulation for mountain nights. The comfort temperature should match the area and season: 0°C to +3°C for the Alps and Pyrenees in summer.
Hiking generally means a day outing with no overnight stay, while trekking involves several days of walking with wild camping or nights in mountain huts. The distinction matters when choosing a sleeping bag: on a day hike, no bag is needed. When trekking, weight and packed size become decisive because the bag is carried every day.
In France, night-time mountain temperatures range between 0°C and +10°C in summer depending on altitude and area. A bag with a comfort rating between 0°C and +3°C covers almost all French routes (GR20, GR5, Tour du Mont Blanc) from June to September. Above 3,000 m or outside summer, allow an extra safety margin.