M Degree Down Overbag: Boosting your sleeping bag's warmth by 20°C. A 0°C bag in its own right

Our M Degree sleeping bags are amongst the lightest down bags in the world, and we wanted to design an exceptionally light Overbag to pair with them. Cut wide enough to go over our M Degree Bags, the pairings make some of the lightest and most versatile Sleep Systems ever made. Boosting the performance of your inner bag by a huge additional 20°C, the M Degree Overbag is also a wide stand-alone 0°C bag in its own right.
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For summer and winter races, trekking all year round, or for mountain climbing in the Alps, Andes and Himalayas, the M.Degree° Overbag really opens up the possibilities.
The M.Degree° Overbag also fits perfectly over our Ultra, Minimus and Minim 400 bags and our Design Your Own Superlight & Lightweight bags (up-to 400 downfill) .
The optional waterproof Dri-LX outer provides an extra seam-sealed outer shell to the bag. While a shelled sleeping bag is not designed to be used alone in heavy rain (the hood area is open to the elements) the shell does protect the bag when it is used outdoors without a tent, for example in a snow-hole or under a tarp.
Get all-year-round versatility by using an Overbag with your light inner bag. Only carry the lightest sleep system you need. In summer just pack your lightest bag, in autumn and spring pack just the warmest, and then in winter take both bags.
Overbags (which go over your standard sleeping bag) have been a firm favourite of our clients from the start. They were the start-point for our Sleep Systems framework, and kicked off a new approach to layering up of down gear to sleep in. Now the latest developments in lightweight fabrics have made us look again at the full potential of using an overbag.