Naturehike MG270 lightweight synthetic sleeping bag — 3-season camping and trekking
The Naturehike MG270 sleeping bag uses 135 g/m² Sundouce Cotton fill, a hollow synthetic fiber designed to maintain its insulating properties in the presence of light moisture, unlike natural down whose loft collapses upon contact with water. The waterproof 20D 380T nylon outer fabric and the antibacterial lining of the same composition contribute to a weight of 1.16 kg in size L, with a packed size of 25 x 22 x 40 cm.
GRS certification and fluorine-free fabric: verifiable material traceability
The outer fabric is Global Recycled Standard (GRS) certified, number ETK-00042501-MUL-2508, with documented fluorine-free testing (reference 70.404.26.10138.01). The water-repellent treatment is PFAS-free, which eliminates the persistent fluorinated compounds found in many previous-generation outdoor fabrics. The YKK zipper is one of the few verifiable hardware specifications in this price segment.
ISO 23537-1 / GB/T 38426-2019 thermal standard
The MG270's temperatures are measured according to the ISO 23537-1 and GB/T 38426-2019 protocols, two standards that coexist with identical measurement protocols (instrumented thermal mannequin, standardized laboratory conditions). This dual reference makes it possible to compare the comfort temperature of this bivouac sleeping bag with that of other bags tested according to either standard, without any methodological discrepancy.
20D nylon antibacterial lining
The inner lining uses the same 20D 380T nylon as the outer fabric, with an integrated antibacterial treatment. This material consistency limits differences in performance (drying, durability) between the inside and outside of this trekking sleeping bag.
If you prefer a natural down filling with a more abrasion-resistant 20D fabric in this same 0°C range, the Flame's Creed 20D is worth comparing.
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 Naturehike MG270 has a comfort temperature of -2°C and a lower limit temperature of -8°C, measured to the ISO 23537-1 / GB/T 38426-2019 standard. These values apply under standard conditions: sleeper in thermal base layers, on an insulated sleeping mat. It is designed for Bivouac, trek use (3 seasons).
The Naturehike MG270 is filled with cotton. Cotton is breathable and comfortable for static camping and summer nights, but unsuited to multi-day wild camping because of its weight and bulk. The Naturehike MG270 weighs 1160 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.