Kayaking in Greenland with Sam Cook
"During August of both 2013 and 2014 I have been on sea kayak expeditions in Greenland where the bags have been tested in temperature ranging from just above freezing to as low as -10°C. It is a pleasure when you know the temperature is dropping just to slip into another bag and double the warmth factor. This has been achieved mostly with an 'Overbag' and 'Minimus' bags."
Technical Note: Using the Minim Overbag with the Minimus stretches the temperature rating from +5°C (Minimus alone) to -18°C (both bags together). As a halfway house the Overbag by itself has a rating of -5°C.