Zip-Pak's Leakproof zipper profiles enable manufacturers of food products that contain liquid to provide a leakproof resealable feature on consumer packaging. The zippers limit product exposure to air for optimal freshness throughout multiple uses. They enable frozen food, prepared foods with sauce and marinated meats in flexible pouches to remain inside the package without leaking. After the zipper is engaged, pressure exerted by the contents of the pouch causes the specially shaped profiles to lock together, creating an airtight seal.