The US authorities don't allow Swiss Army Knives or similar in your carry-on bags under the no-blades rule since Swiss Army Knives do include a blade tool. (I haven't checked the details on European rules.)
Still, I'm wondering if anyone here can report of occasions when you have had a Swiss Army Knife in your carry-on that didn't get noticed or did get through?
I believe RS has said somewhere that he will just buy one when he arrives since it is useful for picnicking and general chores/maintenance, and I also recall a local camping supplies store that had a big crate of used Swiss Army Knives that I think they got from a bulk auction by airport authorities that had confiscated them.
I have had small scissors and similar items squirreled away with my toiletries that didn't get a second look, but I haven't tried it with a Swiss Army Knife or a multitool.