One Planet Cocoon -8 (733 Grams) 2025

The Cocoon has one of the best warmth-to-weight ratios in our range, making it a popular choice for the lightweight adventurer. The sumptuous, highly breathable 10-denier Vapour Vent is used as both inner and outer fabric; it’s a real weight saver, as is the body-hugging mummy shape. Your down won’t be going anywhere thanks to the combination of vertical chest baffles and our famous V-baffles, while the hood and neck closure stop your warmth escaping. The flexibility of a full-length zip helps your night time metamorphosis into a well-rested, happy little camper.

Now featuring Storm foot technology: water- and wind-proof, breathable fabric on the footbox.

Specs:

Down: 800-850 Loft hydrophobic down

Comfort Rating: -2°C

Limit of Comfort: -8°C

Extreme: -26°C

Weight: Small 733G, Regular 786G, Large 833G

User Height: Small 170cm, Regular 187cm, Large 200cm

Shoulder circumference: Small 152cm, Regular 158cm, Large 167cm

Hip circumference: Small 145cm, Regular 148cm, Large 160cm

Lower Leg circumference: Small 115cm, Regular 115cm, Large 118cm

Stuffsac size (Uncompressed): All sizes sml/reg/lrg 6L (17 x 19/20/21cm)

Temp Ratings

One Planet sleeping bags are rated using the international standard for sleeping bag performance, ISO 23537-1. (This is a revised version of European Standard EN 13537.) This means every sleeping bag has two ‘real world’ and one extreme rating. To determine what temperature might be most suitable for you see our technical pages.

• ‘Comfort’ rating is based on a ‘standard’ woman having a comfortable night’s sleep.
• ‘Limit of comfort’ is based on the lowest temperature at which a ‘standard’ man is deemed to be able to have a comfortable night’s sleep. This is the figure we use in our product descriptions.
• ‘Extreme’ rating is a survival rating for a ‘standard’ woman. According to ISO 23537-1, ‘a strong sensation of cold has to be expected and there is a risk of health damage due to hypothermia’. This is a survival rating only, and consumers should not rely on this rating for general use. The best guidelines are the comfort and limit of comfort ratings.

Ethically sourced down
Our down is ethically sourced, harvested and cleaned before purchase, with both the down and our supplier passing independent International Down and Feather Laboratory (IDFL) audits relating to ethical traceability. This means that the white down and feathers we purchase are from animals that haven’t been live plucked or force-fed at any point during the supply chain.