For a while my dad had a padded "golf bag" Humidor that he was going to send to my grandfather, and I finally (after some ten years of it being there) found a use for it. It is the perfect size to hold my little 6" bong. It even has a little side pocket, generally meant for cigar cutters but now the stem goes there. Pics sometime, in case you run into one.
Cause with this, you can hit it the car. Just pack a water bottle with you, whip the bong out, fill with water, hit, then dump the water out, shove it back in its case and back under your car seat it goes.