We stay pretty organized, but that's for three reasons:

1. We don't take a lot of stuff. When there is less stuff, there is less stuff to get messy.

2. There are two of us, and so we each have 1/2 the stuff---and it always goes in the same place.

3. We do like stuff bags etc. The food goes in the bear can. The sleeping bag and pad go in the bottom of the pack. The water bottles go in the outside pockets. Tent in one pack, cook kit in the other...