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I've been doing one night weekend trips out of a ~30 liter with about 3 liters of added pouches. You give up some things for this (using a bivvy, 3 liters of water, very little food, a manually inflating sleeping mat, not much for clothes), but it's doable in the right environment with the right clothes. I'm probably going to go a slightly higher so I can carry more water, clothes, and have a real suspension.