Peak Design Lens Changing Kit Adapter for Canon EF
For those occasions when you're carrying more than one lens, the Canon EF Lens Changing Kit Adapter from Peak Design will help you change lenses faster, and with added versatility. Simply attach the Lens Changing Kit to a backpack, strap, bag or belt. With this kit you can change lenses with one hand, while at the same time, having a convenient place to store the lens you just removed. An added benefit is that by storing the lens outside of your camera bag; space will be freed up for other gear.