OpTech USA Utility Sling Duo - 2-Camera Shoulder Sling and Soft Pouch (2-Pack)Optech Utility Camera Sling Duo (Black) The Utility Sling Duo offers quick access to two pieces of gear while maintaining the security of a strap worn across a single shoulder. The Utility Sling Duo comes with four of OP TECH USA's exclusive Uni Loop Connectors. Gear hangs securely at the sides and will glide up and down the sling without interfering with a camera's tripod mount connection. Most cameras will only need one Uni Loop Connector, but for