Mummy sleeping bag DEUTER Astro 300 +2°C / 36°F Ripstop Blue, width 760 mm, depth 490 mm

The Deuter Astro 300 is a mummy-style down sleeping bag designed for cool to moderately cold nights. Its H-shaped baffle system with upright walls allows the down fill to loft fully and provide effective insulation for sleeping comfort. The bag is bluesign® certified, Green Button certified and filled with Responsible Down Standard (RDS) down, reflecting stricter environmental and social manufacturing criteria.

Advantages

The upright H-baffle construction maximises loft and thermal efficiency while minimising cold spots. The mummy shape reduces dead space and improves heat retention. Certification with bluesign®, Green Button and RDS ensures the materials and production meet recognised environmental and animal welfare standards.

Suitable for

When it may not be suitable

This sleeping bag is designed as a mummy bag with a narrow cut and may feel restrictive for users who prefer roomy rectangular bags. It is rated for temperatures around +2 °C (36 °F), so it is not intended for very cold winter expeditions or high-altitude mountaineering.

Key specifications

How to use

Unpack the bag and allow it to loft fully before use to reach optimum insulation. Zip the mummy bag closed and adjust the hood if present to reduce heat loss around the head. For best performance, use a sleeping pad underneath to prevent conductive heat loss to the ground. After use, air the bag if damp and store it loosely in a dry place or in a large storage sack; use the compression sack only for transport.

What to consider before purchase

Recommendations

Use the Deuter Astro 300 with an insulating sleeping pad and a liner for added warmth or hygiene on multi-night trips; follow the manufacturer's care instructions to maintain loft and performance.