By using the included manual vacuum pump to create a "vacuum state" inside the storage container, freshness and dryness are maintained, enabling long-term storage. The vacuum effect allows you to make pickles in half the usual time. To use, place food inside the container, close the lid, and secure the four buckles. Then, set the included vacuum pump on the recessed part in the center of the container and move the handle of the vacuum pump up and down to easily create a vacuum inside the container. You can heat food in the microwave with the lid removed. The storage containers can be stacked, allowing for efficient storage in the refrigerator or on a storage shelf. Product Size and Capacity Small: 92X116X70mm (330ml) Medium: 121X163X70mm (600ml) Large: 121X163X110mm (1000ml) Extra Large: 121X163X150mm (1400ml) Pump: 37X48X150mm Box Dimensions: 155X205x200mm Weight (including box): Approximately 835g Materials: ABS resin / PP resin / Silicone rubber 2580