Let me just say I love the Big Agnes sleeping system and can't imagine ever returning to the conventional bag, but I can't figure out their temperature rating scheme. I switched to this bag from the Gunn Creek (rated to 30 degrees F) because at temperatures in the mid 30s I was quite cold. This bag (rated at 15 degrees F) was a little warmer on nights in the 30s, but when temperatures dipped to th
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