If they see it you will almost certainly have your Swiss Army knife confiscated, and probably tent poles, pegs, etc.

I have had a corkscrew removed from my hand luggage at MAD before August 11th -- all very polite but security agent explained "this could be a weapon."

So, as Muddy advises, I would check all this stuff. If you are flying direct MAD - EZE and not going via North America, there is no secondary screening.