I would recommend trying out whatever bag you buy before you buy it. My dad bought a 0 degree bag from Big 5 sporting goods. After sleeping in this bag I believe the 0 degree rating could only be placed on this bag to keep you alive over night. Its paper thin and a few blankets would do a better job. I like Sierra Designs personally. I know they aren't very popular but I have several bags from them and really like the loft and they are true to the temp they advertise.