Case Size: 1/4 lb. Single 5 lb canister of aluminum‑free baking powder. Rumford Baking Powder is a fast‑acting, double‑acting, aluminum‑free leavening agent that provides reliable rise in cakes, biscuits, and pastries. This 5 lb canister is ideal for professional and home bakers. Store in a cool, dry place and reseal between uses to retain potency.