Non-Glass Enclosure Options?

I have to keep in mind that I'll probably be moving in less than 5 years and I live on a 2nd floor apartment. Just hauling a 29g aquarium up those stairs was a huge problem, as I'm very lightweight and not very strong. As such, it'd be a terrible idea to get a glass enclosure for ETSs.

Does anyone have much experience with other kinds of enclosures? I don't necessarily need it to be a pretty one, just functional, and more importantly relatively lightweight.