For When You Really Want to wear an Apple Watch, here's the Sinn Dual Strap System - Monochrome Watches
Camera Harness for 2 Cameras – Slim Dual Shoulder Leather Camera Strap – Camera Straps for Photographers with Safety Tether Adjustable Size, Color Black : Electronics
ztowoto Camera Shoulder Double Strap Harness Quick Release Adjustable Dual Camera Tether Strap with Safety Tether and Lens Cleaning Cloth for DSLR SLR