The white ones are getting ready to shed their skins. The striped ones have already shed and they eat a LOT more.
Their appetites increase along with their size, so I gather more leaves each day.
Last weekend I went to the John C. Campbell Folk School for a English Country Dance weekend and took the little guys with me. (It was really fun, but that's another story.) Their home at that time was a recycled envelope box, which I placed inside a copier paper box. They stayed in my room (luckily I did not have a roommate to negotiate with), but had to accompany me on Sunday as we had to get out of our housing by 9 am, but the event wasn't over until 1 pm. I couldn't leave them in the car, but a copier paper box stashed under a bench doesn't seem to freak people out too much. Some people did think I was a little bit crazy, but other folks were fascinated.