I really don't take that much with me when I'm on the go (except for long weekends or traveling away from home). I have been known to travel with just my journal, my rapidograph pen, my lattes and sweets pens, glue sticks (with extra in the hotel) and a very small amount of collage ephemera. Really, I have made art with crap, I mean, paper stuffed, um, stored in a small wet ones container (which, by the way, also fits said glue stick and journal). It can be done.
For now, I am traveling with a bag o' said stuff, and boy, am I set for an art emergency!
(The above photo is what happens when someone asks for a picture of the inside of my art journal bag. As a teacher, I like to please. Please remember that one does not need this much crapola, ahem, art supplies, to be able to make art. Time, effort and passion along with a small handful of supplies will more than suffice!)