Try taking a look at this:
http://glassattic.com/polymer/storage.htm. Glass Attic is a wonderful site FULL of information about polymer clay.
I've found that you have to experiment a bit. I had a roll of extremely old (20 years or so) plastic wrap that worked wonderfully, but when that ran out, I tried new plastic wrap and found that it leaches the clay. I also have a couple of scrapbook containers from Michael's that work well with unbaked clay, but my white plastic drawer dividers from Target or Bed Bath and Beyond can leach the clay. In general, I've found that translucent plastic containers work better than opaque plastic.
Try putting some unformed, unbaked clay in your container before you put an actual sculpture in it and wait a few days. If it's not leaching into the container, you're good to go.
Depending on your living situation, you might invest in a toaster oven to bake your creations. I use one here at my house because it heats up more quickly and it can live in my garage, just in case something burns. Mine is nice because it's also a convection oven. The only time I had a batch burn was when the (extremely touchy) oven temperature knob got bumped up over 300 degrees. That did teach me to be very careful to check the temperature setting AND the little oven thermometer before putting anything into the oven.
Good luck at college!!