If you don't mind spending a little more, Big Apple now has lab breeder bins for like $45 bucks for their largest size. I picked up a few of those, myself. It just seemed like it was worth the reduction in my effort to get them. If you aren't familiar with them, they have a very tough plastic tub with a metal grate over the top. On one end is an inverted triangle. One half of this triangle holds a water bottle, (or two, in the largest bins), and the other half holds the lab blocks. The rodents reach up and chew the blocks through the wire, so they aren't sitting down in their cage where they can soil the blocks or get them wet. When it comes time to clean, you just unlatch and lift off the wire top, food and all, remove the rats, dump and wipe out the plastic bin, replace everything, and you're all set. I have dealt with glass tanks, AND tried the sterilite bin cages...the glass are horribly heavy and a pain to clean, and the regular plastic bins eventually get chewed. I also had problems with the water bottles leaking. (It's very important to make sure that your water bottle sits at the correct angle when you attach it to the side of one of those big tubs)