Anti-theft bags are often sold to travelers due to their ability to prevent or at least delay theft. For wallets, it may be a messenger bag with a secret pocket. The belt may be lined with metal mesh to prevent cuts, or with an RFID pocket to prevent scanning of your passport and credit card. It's easy to get caught in all the troubles, but there are only a few features that can prevent theft of the bag actually needed. The first is a zipper or some form of sealing. When a traveler places an open bag in an invisible place, most crimes are committed for convenience.