Always bring a few empty boxes for exposed film. Mixing exposed and unexposed film in the same box is a bad idea, IMO...

I always carry a notebook. My holders are simply marked 1, 2, 3, etc. If there are different films in different holders, I write in the book which holder contains what. I then make notes of the exposure details and any developing hints (+/- development, compensating or straightline developer etc.) in the notebook.
At least that's my ideal way of working, it doesn't always happen like that.

A changing bag is a lot lighter than 10 extra holders. As long as you stack the used films in a consistent way in the box, you can refer to the notes to sort the fims in the darkroom later.

Quickloads are (probably) nice, but there are a limited selection of films and even more limited selection of sizes...