Sonic™ Down Mummy Sleeping Bag update Beyond functionality and high performance

Beyond functionality and high performance

a stay-open collar for hassle-free inflation

Side pockets are adjustable to accommodate even the beefiest water bottle or an extra layer

and we’ll handle the rest

Sonic™ Down Mummy Sleeping Bag update Beyond functionality and high performanceSonic is built to be the only bag you need from 20F to 40F. The Backpacker Editors Choice award winning big mountain bag offers exceptional warmth and tuneability with a reduced environmental impact. This bag features our next generation Thermo Gill vents, with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine tuning of comfort from within. Sonics chevron baffle construction better