I'm a field recordist, and so often find myself out in the open, and sometimes on very long trips to quite inhospitable conditions. I carry a lot of SD and micro SD cards for all the recorders I have with me. This waterproof box keeps them safe, and would even keep my recordings safe if my bag dropped in a river or something like that (hasn't happened so far). It's also quite small and holds a lot of SD and micro SD cards, so because it takes up very little space it's ideal for field recording trips.