Where do we store CAP EX?! A new member question.

[Kevin Barney]

Hey all,

Where do we store CAPEX (capital expenditure) and other long-term money?

 Under mattress? Bank account? Stock market? Use it for next property and become uber-leveraged? 

 @Brandon Turner often talks about saving $100 per month or so for CAP EX, but we might not need this for years (hopefully). Where do we put it?

FYI: CAPEX means the long term "capital expenditures" of a rental property such as new roof, new water heater, ect.