OXO POP Stainless Steel Top 4 x 6 Inch Storage Container. There doesn't seem to be a lot of room in this container, so its use is limited. The air-tight seal locks in freshness to extend the shelf life of staples like coffee, baking powders, spices, pet food, leftover sauces or other liquids. POP the button on top then twist the metal lid to remove it from the bottom plastic portion.