One thing that I really like about working in the journal is the ability to anywhere and anytime. Whether it's in a little journal or in the big 11"x14" journal, it's nice being able to take the journal with me and work in it. I've been known to work in coffee shops, bars, restaurants, airports, and hotel lobbies. Today it was the coffee table.
This portability is one of the reasons that I use the materials that I do in the journal. By limiting myself to watercolor, watercolor pencil, collage, pens, markers, and a few other materials, I can fit everything in a brush bag and a couple of pencil pouches. I'm not limited to a dedicated studio space, making it much easier to get to work. Having the flexibility to pull out the journal anytime makes anywhere the studio.