I work at Vera and though I much prefer our signature cotton, the lighten up styles are just right for theme park travel. I highly recommend the Lighten Up Slim Crossbody. That's the bag I'll be taking on my next Disney trip. Size-wise, I can hold all the necessities, it's perfect for water rides, and not so "precious" that you worry about setting it down on the ground and dirtying the cotton. There are a few bookbag variations as well, if you need more room. They go from a normal bookbag to a very large one, that actually holds more than the campus.