I'm in the market for a new cold weather bag. My warm weather bag is a Zpacks 30 degree bag or I use my Jacks R Better quilt. So I was considering the Zpacks 10 degree bag or the Mountain Hardwear Phantom 15. The Zpacks bag is nearly a pound lighter and I'm already familiar with their products. Does anyone have any preference or know of another option that I should consider? Thanks in advance for the advice.