why would you then put it in the seat back pocket?
well, I wouldnt keep that thing in my front pocket!
on that note, riding ferry boats to work each day, if someone leaves a bag or backpack unattended, and the crew finds it, they stop the boat, get the Coast Guard to search the vessel, then the bomb squad to remove it...after being late to work, or worse 3 hours late getting home, we passengers started walking the boat, and if we found unattended stuff, we would sit there and wait...and explain to the owner how happy we were, or toss it over the side...