DescriptionAnti Theft Backpack important part of the anti-theft backpack design. They are made of slashproof fabric. So if the thieves decide to take a stab at them with a concealed knife, they will remain undaunted. Slashing is a common technique when you are standing close together in a crowd and opening zippers might be noticeable. The miscreant can just slash the bottom of the backpack and make off with your valuables.