Just a general travel tip. I almost had my backpack stolen in AMS. A biker was passing from the opposite direction and he grabbed the handle on top. I had been warned about pick pockets and such so I had one hand on the strap of my pack so he didn't get it, and to boot he almost fell off his bike. Don't keep all your money in one spot. I carried about 40 euro and one credit card in my front pocket and the rest of my credit cards in my pack. This way if someone was looking at where my money was all they saw was me going into my front pocket.