I purchased a clear stackable bin which fits perfectly in the back of the cage. I then placed two tupperware bins on either side for bedding. This keeps the two bins from being pushed around by the guinea pigs and keeps them from getting into the far back corner to pee or chew. The brick in the center is used to keep the tupperware from moving around and is used as a stepping block. When it is cleaning time, I pick up the tubberware bins, scope out the wet areas or dump it if it is too messy, vacuum any mess in the clean bin, refill with aspen and done. Process takes about 2 minutes.