It's just for a 2 1/2 day, 2 night trip: with food, without water.

I did figure something out on the trip from which I just returned.
This is going to be a big "duh."

Brace yourself!

If one uses one's sleeping pad as a pack frame (tube style), one's pack will never be smaller than the cylinder created by the sleeping pad. Did I mention I have three degrees? blush
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Why am I online instead of hiking?