Had a Paul Frank bright pink Nirve cruiser in mine. Was chucking the last of the ex slags crap out. Took a bit out of my paint work, but rather large bike.
If you have a mountain bike say small jump bike it is possible to fit in the back with seats up and easier to get in and out. Front wheel off, back wheel goes up on back seat and fork then rest in the foot space. Bars poke down the side of seat so watch your door car (bit of cloth round brake lever).