I don't always have the same, but currently there are 2 35mm loaded, both Holgas are loaded (with expired film), the Hongmei is loaded and in the diaper bag with the light meter, and I have 2 loaded 4x5 holders with the Crown Graphic (only shot 2 sheets the last time it was out). It's possible the Hasselblad has film in it and maybe even the Pentax 645N, but I think I just finished that one last week.
I do sometimes have to finish a roll in order to put in what I want to shoot, but I frequently get images that way that I really really like.