Minimalist sleeping setup for summer trekking
The Aegismax Air directly targets ultra-light hiking and bicycle touring enthusiasts. When carrying your gear for several days under the sun, every gram counts. This ultralight sleeping bag provides a simple answer: eliminate the superfluous to keep only a highly efficient auxiliary insulation, perfectly suited for mild summer nights.
Extreme compactness and natural down
With a weight under 500 grams and a compressed volume of one liter, it takes up less space than a water bottle in your backpack. The snug mummy fit allows the interior to warm up very quickly. The use of RDS-certified 800-fill power down ensures gentle warmth in the early morning, while the 10D ripstop fabric protects against light dew if you choose to sleep under the stars.
Half-height closure: from a closed bag to an open blanket
The zipper opens along three quarters of the bag's length, allowing it to be laid flat as a blanket on nights when temperatures rise, without having to undo the entire side seam. This partial opening also facilitates quick ventilation of the interior in case of night sweats in this ultralight sleeping bag.
Long version: a minimal weight increase for more comfort
The Long version (480 g) adds only 42 g compared to the Regular version (438 g) to accommodate heights of up to approximately 190 cm. This small difference allows taller individuals to gain more comfort without sacrificing the ultra-light spirit of this trekking down sleeping bag.
If you wish to maintain this formidable summer compactness but prefer the insulation and durability of a premium goose down filling, the Aegismax Air-E version will meet your expectations exactly.
Why pay more for the same performance?
The Aegismax Air was compared with the Millet Light Down 11°. 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 Aegismax Air has a comfort temperature of 11°C and a lower limit temperature of 6°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, trekking use (Summer).
The Aegismax Air is filled with 800 fill power, RDS certified. The Aegismax Air weighs 438 g, which places it in the ultralight category.
A 3-season sleeping bag is designed for spring, summer and autumn. Its comfort temperature sits between 0°C and +5°C, which covers most wild camps in France up to 2,500 m outside winter conditions. In winter or above 2,500 m, a dedicated cold-weather bag is needed.
A 3-season bag is suited to night-time temperatures between roughly 0°C and +15°C. Below 0°C, thermal comfort is no longer assured without extra equipment (liner, additional sleepwear). Above +15°C, most sleepers will find the bag too warm: venting through the foot zip helps regulate.
For the vast majority of walkers and trekkers in France (GR20, GR5, Tour du Mont Blanc from June to September), a 3-season bag with a 0°C comfort rating is sufficient. A 4-season bag is only needed above 3,000 m outside summer, in winter conditions, or for exposed high-altitude wild camps in autumn.