I wasn't sure where else to put this very newbie question.

I am planning a trip for late summer, and it's where I really want to do my first intensive LF photography. I've done both 35mm and 120 film photography, but this time I hope to do both color transparencies in 4x5, as well as some 5x7 B&W. I have half a dozen holders in both sizes, but obviously want to take more than a dozen images in each. When I want to change exposed film for new film in the holders, what is the best way to store the exposed film? In an empty film box?

I feel rather silly asking this question. I know that those who know the answer must think it's very obvious. But I live in a small town with no one to see in person who might help me, so I'm on my own. I've done loads of reading and learning, but this is one question I have not found an answer for; I suppose just because it is so basic.

I'll have other questions that are just about as innocent and naive.... In fact, I just thought of another! But that will go in a different thread.