How are they, or should is the REI store brand better? What else is good out there?<br><br>Will be going to Yosemite next week, any and all info will be highly appreciated. I get cold easily as I am a skinny little runt. I tend to wear a jacket in anything less than 60F, but I can run around all day in the heat (80+F) with long pants no problem. What temperature rating should I get? I have seen some 3-season bags marketed, should I get a cold bag and a rest-of-the-year bag, or should I get a one-bag-for-all-seasons bag?