this bin houses one juvenile Syrian and will get a larger flying saucer and wheel soon - we are thinking about a second story but first we need to build a second bin for our ( drumroll ..... ) second hamster
I did not do much to the bin itself - I added ventilation to the lid ( cut out a square and zip- tied a cut down mesh carrier lid to it that we had laying around - usually I would use wire cloth ) - I use a store bought bottle holder that they sell for aquariums. The bin itself is not cut or drilled into at all ...