Do You Know How Much Fluid You're Going to Need?

Drinking to thirst is one thing, but knowing roughly how much fluid that is going to require is still important from a planning perspective. Testing your sweat rate can be incredibly useful in working out how much fluid you expect to need. And then you know you're not going to run out of fluid or carry unnecessarily high amounts of fluid,. You're just carrying extra weight for the sake of it as well.