A closure for a microwavable container has a top wall and a skirt with at least one tab formed of a pair of straps and a thumb grip. The tab has an internal bead extending about its inner periphery which provides a shoulder which abuts a shoulder on the bead of the container to retain the closure on the container. The tab can be gripped by the user's thumb to apply force outwardly and upwardly to disengage the internal bead.