The main reason thieves are breaking your rear quarter window is to drop the rear seats down just to take a peek in your trunk.
Putting your belongings in the trunk before parking will not help. They will still break your rear window, then when they see you have a backpack or computer bag they will break the larger window to steal your backpack.
Don't 'leave anything in the trunk and fold the seats down. This lets the thieves know there is nothing in the trunk.
The sticker I put on also helps to give notice that there is nothing in the trunk and the seats are already folded down.
No guarantees that they still wont break the window, but since i have already dropped the seat for the thieves to look inside the trunk, there is no reason for them to break the window just to drop the seats.
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