A cap-sealed bottle wherein the shoulder of the bottle commences inwards from the top of the bottle, leaving a peripheral ledge, the shoulder and the upper region of the body are elliptical and the shoulder portion is longer on one side than the other, the shoulder joining the body of the bottle to the neck of circular cross-section; and the cap comprises a hollow cup-shaped member having a downwardly-extending skirt, a snap-lock liquid-tight sealing arrangement internal of the skirt and at least one internal rib adapted to ride over the shoulder and which rib also serves as a guide means to position the cap on the bottle.