A container assembly including a container (102) and a cap (110) disposed on the container. The cap is movable between a closed condition and an open condition. The cap has two opposing side wall regions and an end region disposed between the two opposing side wall regions (144, 146). At least one of the side wall regions has a container-engaging portion movable (152, 154) between a closed position where the container-engaging portion engages the container to resist opening of the cap, and a second position where the container-engaging portion is disengaged from the container to allow opening of the cap. The end region of the cap is in a snap-fit relationship with the container. Also included is a cap having these features.