A universal container seal for sealing a container opening includes a resilient body having a top surface and a bottom surface. The body is further configured in a geometric plan form and having a width significantly greater than a thickness, the thickness being greater at a center of the resilient body than at a periphery of the resilient body. At least one gripping portion extends from the top surface of the body. A central portion of the bottom surface of the resilient body is concave. The concave central portion can be in vertical registration with one or more gripping portions.