The Think Tank Filter Hive organizes both round and 4″ x 6″ filters and accessories into a unified kit. The Filter Hive fits within your different camera bags, can be worn on a belt, or on the modular rail of MindShift Gear backpacks, or hung on a tripod. Its padded exterior case and accordion-style removable insert holds up to six flat graduated neutral density filters up to 4×6” (100×150 mm) and six round filters up to 82mm diameter, including the thick 1.5 cm variable neutral density filters.