The Arc Expedition is the warmest bag in Nunatak's line of adjustable girth sleeping quilts. Based upon a heavily modified Arc Alpinist for 4 season capacity, this lightweight sleeping bag surrounds you with a luxurious 3.5" loft and boasts more than a pound of 800+ fill goose down. Standard features are a 4" differential cut and shock cord and toggle neck closure.

The Arc Expedition is cut with the roomiest fit of all the Arc bags, making it an ideal winter over-bag for the Nunatak Alpinist, when the temps drop deep into the negatives. The generous size will allow the Arc Expedition to be used as an emergency two person bivvy for serious summit bids in the high ranges.

So here's a real opportunity to shave substantial mass off your already heavy winter camping load, while maintaining adequate protection and comfort. When used in conjunction with our Down Balaclava, a substantial ground pad and a light mountaineering tent, you'll have an unbeatable sleep system for the snow.