Sonic Down Mummy Sleeping Bag brand-The Mountain Air Despite only weighing an ounce

Despite only weighing an ounce or two above 3 pounds

Usage: SKS Cores for the towers

The IPX4 ingress protection rating means this is engineered to keep up in the field

The welded build and waterproof zippers keep dry gear dry or can be used to isolate wet clothes

Sonic Down Mummy Sleeping Bag brand-The Mountain Air Despite only weighing an ounceBuilt to be the only bag you need from 0F to 40F, weve updated our Backpacker Editors Choice award winning big mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact. With this bag, we are launching our next generation Thermo Gills with a new multi stage zipper system that dramatically increases the usable temperature range of the bag and allows fine tuning of comfort from within the bag. Sonics new chevron baffle