Zerogram 850fp Pertex Sleeping Bags

Made for lightweight backpacking, mountaineering, and any time you need to stay warm in the wild, these Zerogram sleeping bags come in four models with EN comfort limits ranging from 26.6 to -5.8 degrees Fahrenheit. Each has a Pertex shell and 850-fill-power DownTek ZeroPFC goose down, which is water-repellent, fluorocarbon-free, and DWR-coated to stay dry 10 times longer than untreated down.

In each of these sleeping bags, vertical thermal channels and FlowGate technology ensures body heat is evenly distributed, while special Y-shaped filaments help the fiber structure hold its form wash after wash. The draft color is microfleece lined on one side for supreme comfort, and is highly contoured to trap heat inside. The High Sierra NX is the lightest of the bunch at 33.2 ounces and a 15.8º F rating. For more warmth while backpacking, opt for the 40.9-ounce White Wolf NX. If you’re planning on alpine expeditions, consider the Cholatse NX, or for the most extreme adventures, the Diameter EX. 

Founded in 2011 in Seoul, South Korea, Zerogram draws inspiration from naturalist John Muir and other 19th-century outdoor pioneers. The company’s philosophy is rooted in lightness—both in the way we pack our bags and the way we treat our planet’s resources. As a result, the product line features lightweight, minimalist, innovative designs for tents, sleeping bags, and other accessories. Zerogram takes its name from the idea of zero weight: “Though, in theory, there is no material that weighs nothing, we dream of developing weightless equipment.”