3-season sleeping bag geared towards performance and lightweight design
The Aegismax M3 is aimed at demanding users looking for a 0-degree trekking down sleeping bag under one kilogram. The certified comfort temperature guarantees restorative sleep in spring or autumn, provided this bag is paired with an appropriate insulating mattress to block heat loss through the ground. Its design limits body heat loss even when ambient humidity increases under shelter.
Compartmentalization and certified insulation
Internal baffles stabilize the RDS-certified 800-fill goose down, preventing the formation of cold spots at the shoulders and hips. The ISO 23537 standard ensures a transparent reading of the equipment's capabilities. The 15D nylon offers a precise balance between mechanical strength and minimal weight, ideal for optimizing space in a 40 to 50-liter pack.
550 g filling and water-repellent treatment tested to GB/T 18401
The fill consists of 550 g of 800-cuin white goose down, RDS certified, a figure that allows one to understand the actual insulation density regardless of the total weight of the bag, a key criterion for any bivouac sleeping bag. The DWR-treated outer fabric has been tested according to the GB/T 18401 standard, which assesses the safety level of a textile (Class A, the strictest level, used for products in prolonged contact with the skin). An anti-draft collar at the neck limits cold air entry without needing a constantly adjusted hood.
Compression sack: up to 3.3 L
The included compression sack allows the M3's volume to be reduced to 3.3 liters, a useful benchmark for estimating the space it will actually take up in a backpack, beyond just the weight listed for this trekking sleeping bag. The progressive compression straps avoid putting stress on the down through abrupt packing, which helps preserve its loft over time.
Conversely, if your budget is tighter and you are willing to accept a very slight weight increase by switching to duck down fill while maintaining your 0°C nights, the Aegismax D2 model will prove to be a very relevant technical and financial choice.
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 Aegismax M3 has a comfort temperature of 0°C and a lower limit temperature of -5°C, measured to the ISO 23537 standard. These values apply under standard conditions: sleeper in thermal base layers, on an insulated sleeping mat. It is designed for hiking, bivouacking, trekking use (3 seasons).
The Aegismax M3 is filled with 800-fill-power white goose down, RDS certified. Down offers the best warmth-to-weight ratio: it packs down small and weighs less than synthetic insulation of equivalent warmth, which makes it the natural choice for wild camping and multi-day trekking. On the other hand, it loses efficiency when damp and needs careful drying. The Aegismax M3 weighs 888 g, which places it in the lightweight category.
The lower limit temperature is the lowest temperature at which a reference man can maintain his body heat curled up, according to EN 13537 / ISO 23537-1. It does not correspond to comfortable use: below the limit temperature, the sleeper is likely to suffer from the cold. For real use, the comfort temperature is the main reference.
The minimum recommended temperature is the bag's comfort temperature, measured to EN 13537 / ISO 23537-1. For a 0°C bag, this means a standard sleeper can spend a night without feeling cold at 0°C, provided they use an insulated sleeping mat (minimum R-value of 2 to 3) and wear thermal base layers.
For extreme cold (below -10°C), the most suitable bags combine high-loft down (700 cuin minimum, ideally 800 cuin and above) with a mummy cut that limits heat loss. A sleeping mat with an R-value of at least 4 is essential alongside. For nights between 0°C and -5°C, a good-quality 3-season bag with a 0°C comfort rating is generally sufficient.