Summer time downsizing!

In preparation for the big neighborhood garage sale in my grandmothers neighborhood. Eddie an I decided to help my family out cleaning their backyard, garage and basement. Mind you, I went into a crazy cleaning spree right before Julian was born. Just to have it filled back up with things, so I'm hoping this won't be the case this time around. I should have taken a before picture of the back driveway. It was filled with junk and leaves everywhere. I put a sign out saying free and just lined up the curb with some junk. Surprisingly everything was gone the next day! 

What does your family do to avoid clutter? Any organization tips you can offer? 

~Alyssa