Zpacks 20f Mummy Sleeping Bag

The Zpacks 20f Mummy Sleeping Bag is a mummy-cut bag filled with 900 fill-power goose down treated to be hydrophobic, unlike most other bags in the Zpacks range, which use duck down. The fill weighs 419 g, total weight in the Short/Standard size is 625 g, and a -7°C (20°F) rating places it in the 3-season category. A full-length two-way zipper on the left side opens flat like a blanket, useful on warmer nights or for venting. A simple drawcord hood and a draft tube along the zipper trap warmth inside, though it lacks the separate draft collar found on other bags in the range. The 7D Ventum Ripstop Nylon shell with DWR treatment handles light moisture, and the hydrophobic goose down copes better with damp conditions than untreated fill. Unlike the 20f Classic, it does not ship with a stuff sack, an extra cost to factor in. It suits hikers who want a full mummy construction with a hood, accepting somewhat higher weight in return.