Keep ingredients fresh in the James Martin Cook Storage Jar. Made from porcelain, this storage jar has a soft grey outer glaze with a crisp white interior. The wooden lid provides a pleasing warmth to the storage jar whilst its seal helps to keep contents fresh. Dimensions - Length: 12.5cm, Width: 12.5cm, Depth: 17cm. Weight 835g. Capacity 1100ml. The James Martin Cook Storage Jar is part of Denby's collection of porcelain oven-to-table pieces, kitchenware and accessories that are designed to be functional, stylish and suitable for everyday use. The James Martin Cook range will add a touch of contemporary styling to any kitchen with its soft grey exterior glaze and clean white interior.