Part of the modular belt system, this black Lens Changer 50 V3.0 from Think Tank Photo is a water-resistant nylon pouch designed for holding wide-angle zoom lenses such as the 14-24mm f/2.8 or 16-35mm f/2.8. The lens case attaches to any optional Think Tank belt or backpack, so you can easily use it while shooting for switching lenses on the go.