I have a -20 Sleeping Bag, what size Sea...
I have a -20 Sleeping Bag, what size Sea To Summit eVent Compression Dry Sack
should I get?
Its going to depend on what bag you have. Size of bag what kind of fill, is it synthetic or down, what kind of down 650 or 850 etc...
That said I have a large that I use with a Western Mountaineering 0 degree bag (850 down) and recently was able to jam a Feathered Friends -20 or 25 bag (also down) in the same bag.