It seems like it's getting popular to use it for camping in Japan. With some organizers inside, they put cutlery, mugs, spices, seasonings, teas and etc..
Oh and the box style is "Okamochi"!
Well, "Okimochi" means "feeling (polite form)" and if you call it Okimochi box, it sounds like you use the box to care about people so it actually sounds cool, haha.