In the tradition of great ideas made better, we’re making down sleeping bags. Inspired by the bag our founder, Yvon Chouinard, built for himself 45 years ago—a simple mummy-style bag with overstuffed channels and a center-front zipper that let him tie in at belays or cook at bivys—the new Patagonia 850 Down Sleeping Bag is an elegant, realworld bag built with the best available materials and a down-construction expertise that’s been 45 years (give or take a hundred) in the making.