Do you own a lot of "stuff"?

I'm currently in the process of switching storage units. I'm scaling down from a 10'X10' to a 5'X10". Whatever doesn't fit will go into my garage. It's kind of a hopeless battle though. I share another unit with my brother which has all of my Mother's stuff in it. She's been gone for 4 1/2 years but we just haven't come around to going through it all and getting rid of what we don't really need/want.