Lids for a container having an external peripheral rim at the upper end thereof, the lid comprising a top wall; a peripheral skirt depending downward from the top wall and having a bottom-most edge larger in diameter than the rim of the container and an inside surface with a locking mechanism disposed between the bottom-most edge and the top wall and being adapted to receive and engage the rim; and a plurality of slots defined in skirt extending upward from the bottom-most edge to divide the skirt into individually resiliently flexible skirt portions.