Storage ideas

[boolay]

Due to space limitations at my house, I am unable to keep my lovely Kona MTB in a nice cosy garage or even rotting shed, so am forced to keep her outside. I have purchased a large 'bike bag' - basically a huge rubble sack that I'm able to wheel it into. This does a good job of keeping the rain off but as it can't be sealed, dampness still gets in and corrosion has started to occur on some of the bolts etc.

Does anybody have any clever solutions for dry storage for a mountain bike that doesn't require dismantling into various pieces?