Shoulder straps are made from cut-resistant ropes, and come with a locking piece to clip them to each other across the wearer's sternum for extra comfort and security.
The combination lock can be set by the user to any three-digit combination of their choice and attached to steel-reinforced straps, making it secure to anything lighter than heavy tools.
We got a lot of use out of locking our bag, which held our camera, passport, and wallets while we swam. We never had any issues with leaving our valuables out of sight.