The Think Tank Lens Changer 75 Pop Down V3.0 pouch is designed to fit longer lenses such as the 70-200 f2.8 and 100-400 f4.0. It has a unique “Pop Down” feature which increases the bag’s depth so that you can keep your lens hood in the shooting position, attached to the lens. It has a “rotate and lock” mechanism which allows it to be attached to Think Tank Photo belts, for easy access. The Lens Changer 75 Pop Down V3.0 also features a wide mouth opening for quick access, a top grab handle and a one hand draw string closure. It is also well padded to keep your equipment protected. This pouch will attach to any Think Tank photo belt or belt pack (not included). Includes a seam-sealed rain cover.