I use my 20 deg stuff a lot, most anyplace in the Cascades upper 30's is pretty typical at night during summer. If I knew I would be below 3,000 or 4,000 ft in mid summer I may bring the Phoenix and the Golite 40 TQ. Plus I never use a tarp unless rain is likely, and don't like to wear a lot of clothes at night, so I have been cold around 40 deg with my light stuff.
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