The Gladiator Claw is a high-strength plastic gadget attached to the ceiling that you can use to easily hang your bike. It's small, practical, and relatively inexpensive ($19). If you get two, you can hang your bike upside down so that both wheels and the frame are off the ground, giving you maximum walking room. The only catch is that if you get only one Gladiator Claw, the bike may swing a bit if anyone bumps it.