The Filter Pocket was designed to be used both inside our Core Units and as a standalone case. When inside the Core Unit, you can have access to your filters while you set up your camera, without having to access any separate pouches and zippers. It's all there in one location. The Filter Pocket is compact and holds up to four 100mm filters. The dense EVA padded walls are coated with a smooth, scratch free tricot lining. Simply pull the tab to reveal your filters. The convenient cut-out will help you identify each filter, as well as make it easier to pull out filters and put them back in.