How much weight is too much?

It really depends on person to person and their comfort levels. Back in the day, I really liked to rough it but nowadays, I don't mind carrying a little extra gear if it means that my outing be a bit more comfortable.

Also along the same lines; the factors of anticipated weather, distance, terrain, physical conditioning at the time of the trip also contribute to the weight algorithm. I have carried as little as 10-12 lbs which basically consisted of a minimal PSK, siltarp, light sleeping bag, bit of food and water on a warm weather overnight hike. Conversely, I have carried over 50 lbs of winter durable tent, much more clothing, gear, water, food, on a cold winter hike in different terrain but of the same distance warm weather hike.