Preparing for roughing it

I really don't know quite how to explain this. We are about to travel through Asia for five months and need to travel light and be ready for roughing it. Nic has taken this to heart so sat me down and explained that is why she only packed four toilet bags.

"Four toilet bags!?" I said, "What could you possibly need four toilet bags for?"
Apparently it is all essential. I should know better than to ask.