Think Tank Photo Pro DSLR Battery Holder Fits 2 pro-size batteries for Canon 1D and Nikon D3/D4 series cameras Slim, compact design folds in half for easy and safe battery storage Individual pockets for each battery Flattens when empty Exterior: 5.5 W x 4 H x 0.4 D (14 x 10.1 x 1 cm), Weight: 0.02lbs (0.01kg)