Wool sleeping bag BIOPOD ZERO in a practical test

Wollschlafsack BIOPOD ZERO im Praxistest

Wool sleeping bag Biopod Zero in a practical test

High-quality lightweight sleeping bag with a comfortable and functional wool filling


  • pleasant sleeping climate
  • very small and light
  • good cut
  • breathable, optimal moisture regulation
  • windproof and water-repellent
  • easy-care


  • Zipper could run easier
  • not suitable for temperatures below approx. 9°C

Grüezi Bag is a young sleeping bag brand from the Upper Bavarian Alps. I tested the Biopod Zero sleeping bag (outer material 40 denier nylon mini-ripstop / polyamide, filling 85-92% pure new wool) on a multi-day trekking tour (Selvaggio Blue) along the east Sardinian coast in May. We spent all nights outside without a tent.

Grüezi Bag advertises that, unlike down, wool insulates even when wet. Although synthetic fiber is not as sensitive as down, it does not have as good a climate and does not warm as well as down. The innovative alpine wool filling of Grüezi Bag combines the advantages of down and synthetic fibre. My experience confirms this information.

It was noticeable during the night on the ferry deck upon arrival that the sleeping bag stayed pleasantly dry and warm even in stormy and damp conditions. Even the wind was not noticeable in the wool sleeping bag! With night temperatures of around 9-15° during the trekking, the Grüezi Bag offered enough insulation so that I could sleep very well. The small pack size (15 x 20 cm compressed) and low weight (1050 g incl. pack sack) of the sleeping bag were also very advantageous for multi-day tours with a heavy backpack.

In contrast to down, the wool filling remains dimensionally stable for a long time and can be easily machine washed on the wool cycle with wool detergent. Since the wool has an antibacterial and therefore odor-inhibiting effect, you rarely need to wash the sleeping bag anyway - airing it outside is enough.

The manufacturer specifies a comfort temperature of 7°C for women and 2°C for men for this model (extreme temperature -12°C). As with almost all sleeping bags, you have to add about 3°C ​​here to sleep really warm and cozy. The sleeping bag is therefore intended for summer use.

Practical and well thought-out features are the pillow compartment (in which you can stuff a fleece jacket as a pillow, for example), the adjustable hood and the small zip compartment on the outside.

Conclusion: The sleeping bag is very comfortable, light and small - absolute purchase recommendation!

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