How to carry around art supplies when you travel?

[ryuk6]

I generally want to carry sheets, a notebook of Water colour palette, and some gaouche paint with some brushes

I have a small wash bag that I keep a portable water colour palette in with brushes and pad.

Online art suppliers like Jacksons sell pochade boxes that carry your outdoor art gear, and the lid doubles as an easel when you're ready to paint. They're a bit pricey though.

I got an empty wooden box free with an art magazine years ago, and glued lengths of wood into it to make partitions.