Smart Lifties make you take your pack off and carry it in your lap. SAR teams also.

On a irksome note about carrying knives, more indoor events we visited over Christmas/New Year had metal detectors. My son had to bury his leatherman in a potted plant (to retrieve later) to get into the show he has just paid $18 of his hard earned lawn mowing money to see. No mention of the detectors when he bought the ticket. No place to store the tool was provided.

And don't get me started about the "fully activated" spot my wife was said to have which led to some embarrassing groping about by security.