Here you can find Pacsafe's wirenet that can be wrapped around a bag or backpack and then fasten to a pole (as shown on the picture) so that no one can run away with your things.
Wirenet is a smart and easy way to secure your things. Wirenet is especially practical when you want to secure your backpack. The only thing you need to do is wrap it around the desired bag and then fasten it to a pole, lamp post or something silimlar.
This way it will be incredibly difficult for someone to steal your bag even if they try to cut or break the wire, as it is extremely strong.