Zpacks Zip Around Sleeping Bag

The Zpacks Zip Around is a duck-down sleeping bag weighing 471 g, built around a full-length two-way zipper that wraps all the way around the footbox. That lets it open flat like a blanket for warm nights or hot tents, vent just at the feet without unzipping the whole bag, or stay fully closed as a semi-rectangular bag in colder conditions - more versatility than a fixed-zip mummy, though the semi-rectangular cut is roomier and less thermally efficient than a snug mummy shape. An insulated draft tube runs behind the zipper to block cold air leaking through the seam, and because the zipper wraps the footbox on both sides, two Zip Around bags can be zipped together into a double. At 471 g it's a light bag for its shape, suited to hikers who want zipper flexibility across a range of conditions rather than the lowest possible weight of a mummy-only design.