If your bridge has been knocked over, you may want to check to see if the sound post is in the right position by a professional. 
To save any unnecessary damage.  As the pressure from 4 strings is pushing down onto the bass and all that is supporting it is a cylinder of around inch in diameter. I may have a case for sale its a Tom and will case with no wheels and the straps have been taken off and put in the back of the case.  its a "used" case but still very useable  
 
Pm if you're interested. 
 
-F