I did a 200 mile 4 day trip last weekend. When loaded up, I was carrying 8.5L of water… so close to 20lbs right there. Riding a loaded bike is very different than what I’m normally used to. And I found harder to push a loaded bike than pedal, so tried to ride as much of the steeps as I could, even if that meant riding at low 30-40 cadence. I was in a calorie deficit each day, and was wiped by the end of day 4. But thoroughly enjoyed it.