In my opinion a slash proof bag is overkill, but as you already have it, might as well use it,, as long as its comfy for you and not too heavy. I have always used a "normal " purse with a zipper covered with a clasped closed flap. I keep my wallet in an inside zipped pocket. Don't over worry,, just be mindful of anyone within arms reach of you.. don't be too distracted to notice a person standing at your elbow.. Remember, no one can take what they can't reach. There are pickpockets in Europe, but its really not as bad as you think,, just use common sense and you will be fine. I have never put my camera in my moneybelt, its too bulky, only thing in there are my ATM card, my credit card, and my passport and excess( more then one days worth) of cash. I only wear moneybelt when in transit, otherwise I personally use hotel safes , that is a personal choice that has caused me an issue in decades of trips to Europe. Also, pickpockets actually don't want your camera,, they want your cash.