Anything that can tolerate it gets put into an 18 gallon Rubbermaid tote and stored in the garage. The few bits of gear, i.e. computer backup drive, that cannot tolerate garage storage get stored inside the house in a dedicated location.

One technique I've found to hide copious amounts of junk is to put a storage shelf in an empty corner, load it with all your gear, and then hang a curtain (bedsheet, etc) around it. Put the all sleeping bags in mesh laundry bags and either hang them up our place then on a shelf.