Going along what @Jordan Budd said- say you purchase a 20 degree down bag AND a 40 degree synthetic quilt- early season (with appropriate temps) take the 40 degree quilt, a little later when it cools- grab the 20 degree bag, when it gets really cold- bring both. Put the quilt (synthetic) on the outside where body moisture might collect, keeping your down bag dry and at full loft.
A 40 degree quilt + a 20 degree bag together should put you in the -5 range, possibly a little lower.
I've used this chart on numerous combinations and it's pretty close.
A 40 degree quilt + a 20 degree bag together should put you in the -5 range, possibly a little lower.
I've used this chart on numerous combinations and it's pretty close.