After something like oatmeal, I put about 4 oz of water in there, swirl it around, and drink it. It's not a waste of water because I need to drink it anyway. And then about 5 seconds of wiping with a microfiber towel. You spend more than 5 seconds unpacking and repacking a second cup, and you gotta carry it everywhere. To each is own, but I do it this way because it's the most logical thing to do. For sure I don't dump my Mountain House chili in my cup, I eat that out of the bag. But like ramen and oatmeal, oh yeah.