The breakthrough, purpose-built design allows a one-handed lens exchange. This inventive case is ideal for busy photographers who need to switch out lenses as they work. The patent-pending lens exchange feature temporarily holds and separates the two lenses as the photographer detaches the working lens and grabs the second. After the lenses are exchanged, the bag collapses back to a single-lens carrier. The S&F Lens Exchange 200 AW features a travel-friendly design that collapses flat for easy packing into a larger bag.