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The Schlafsackwarmer can be used "stand alone" as an ultra-light, small packable travel companion or as an additional insulation layer in another sleeping bag. As a "stand alone" version, it is with 500g weight and 3.5 l pack volume the travel sleeping bag for all cases. Thus, you always sleep in his "bedding". Grüezi-Bag recommends it as a travel sleeping bag for the hotel, on the bus, on the plane, to stay overnight with friends or for summer camping.
The Schlafsackwarmer is also great as an extra layer of insulation in another sleeping bag. The temperature rating can be increased by up to 10°C by inserting the Schlafsackwarmer. The outer as well as the inner material is made of a very pleasant, soft fabric that does not rustle. The airy ARL-3D insulation can be compressed super small. So much space is still in any backpack or travel bag.