The hinges and supports on the Tilt that allow it to fold are designed so that when collapsed, the chair ends up being as flat as a pancake. So when stacked, the risk of avalanche is slim to nil. But stacking isn't your only option. The tilt also features an integrated hanger so a whole mess of them can be easily hung up like a closet full of clothes. There's no word on pricing or availability just yet, but Folditure has put crazier designs into production, so there's a good chance these will be too. More here.