Anti-theft backpacks can be found in many stores. This means that it is more difficult for anyone else to access your bag. Many backpacks come with zippers which allow you to access the main compartment from your bag while it's on. This means you won't need to remove it and put it in danger of someone picking it up. Some backpacks have webbing that covers the zipper openings. This makes it difficult for anyone to find and zip the bag.