Part of the modular belt system, this black Lens Changer 25 V3.0 from Think Tank Photo is a water-resistant nylon pouch designed for holding compact zoom lenses such as the 24-105mm f/4 and 14-24mm f/2.8 or longer primes like a 105mm macro. 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.