Retort liners and containers including a container body such as a bottle or jar, a closure, and the retort liner, wherein the retort liners exhibit attractive properties such as low compression set under retort conditions, desirable adhesion to a polymeric closure such as a cap or lid, and beneficial oxygen barrier properties. In particular, the retort liners are thermoplastic elastomers formed from compositions including one or more styrenic block copolymers, one or more polyolefins and a softener. In a preferred embodiment, the retortable containers are all plastic packages, wherein the bottle or jar and the closure are thermoplastic compositions and the liner is a thermoplastic elastomer composition.