Has anybody built a sub enclosure that sort of hangs off the back of the rear seats in a 2006 xB, sort of like a backpack? A little hard to describe...

 

i know what your talking about its a neat idea and would make it easier to move out of the way when needed to use of the trunk space

 

Actually, it would be firmly mounted to the seat(s), but it would be where a backpack would hang. Maybe to make it removable it could have bolts attached to the metal of the seatback that could be unscrewed.

 

yea it's been done before but to other vehicles. you can buy the parts from home-depo for the hook latching mechanism and get huge support clamps to sustain for a single box or tube. also get foam and 1/4 wrap one side that leans upon back seats to prevent rattling. tubes are much better to mount as they are also easy to dismount too.

good luck