Sonic™ Down Mummy Sleeping Bag update and durable ultralight PU polyester

and durable ultralight PU polyester that rolls up without adding bulk

As part of our Endless Promise® collection

and we’ll handle the rest

roomy comfort

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

Sonic™ Down Mummy Sleeping Bag update and durable ultralight PU polyesterSonic 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