[Skeever]

Tubes are fine, most cardboard is. I'm guessing you've seen the ErinsHamsters youtube about tube toys ....I found both hams love to wander about in cardboard things, and if they don't like a corner or wall, they just chew a door in it, heh. Compartmented take out Chinese boxes, beverage holders, tubes, boxes, all sorts of things seem to interest them even more than the store bought toys.....

By egg cartons, you mean the cardboard type? I've avoided styrofoam egg packages.....is that okay too? It amazing what degree of interest a hamster can put into something like a beverage holder or an egg carton with treats hidden inside....they're easy to please generally speaking....lol