Anna, art books are really, really heavy. I know. I market them. The reason that they are heavy is that they are printed on really good paper because we're striving to match the reproduction to the actual image. So, I've interesting suggestion. If you are taking a computer, think about purchasing an eBook. I couldn't have suggested this last year as it's only been in the last year that we've resolved the permissions issues that allow publishers to create eBooks for art books. Go to www.coursesmart.com and look at Art Appreciation books. The best, is my (of course!) by Mark Getlein, Living with Art. Art appreciation books combine chapters on what is art, a look at the different media with a brief history. Actually you can buy a view only mode so you wouldn't even have to carry that computer. (No, they don't work on the Kindle yet. We're working on that. Kindle is working on the ability to include illustrations.)
Pam