ive backpacked in europe a handful of times, and as long as youre smart about not flashing your knife around, you shouldnt run into any problems. that being said, a SAK or multitool should cause little to no problems if it happens to be seen by the authorities. sometimes being the "dumb american" can get you out of a whole mess load of trouble as well.

one time i was performing train-station surgery on an in-grown toenail in plain view of cabinierri (sp) with a SAK...i do believe their disgust overwhelmed the urge to bust the scary knife-wielding (and thus a danger to society) foreigner...so they gave me a look and a continued on their way.

what is the name of your sons band? you said sweden, i sure hope that means theyre a metal band <3