A two-compartment container suitable for more uniformly dispersing solid components in an upper compartment into liquid contents of a lower mixing compartment comprising:
- (a) a lower mixing compartment having a bottom, side walls and an open top and having a volume capable of receiving and mixing the contents of the upper and lower compartments;
- (b) a closure means for closing the open top of the lower compartment in a liquid-tight manner;
- (c) an upper compartment having an upper end disposed in the closure means and communicating with an aperture in the closure means, side walls projecting from the closure means into the lower compartment, and an open lower end disposed in the lower compartment;
- (d) a lower flexible and slidable seal means having a downwardly disposed angular flexible skirt contacting a perimeter side wall portion of the upper compartment near the lower end thereof, said skirt having dimensions which are slightly greater than the dimensions of the corresponding inside dimension of the sidewalls of the upper compartment, whereby the skirt is slightly compressed inwardly when the seal is disposed in the upper compartment to effect a slidable liquid-tight seal between the upper compartment and the lower compartment, and said lower seal means being exitable from the open lower end of the upper compartment;
- (e) a mechanical linking means connected to the lower seal means and extending through the upper compartment and into the aperture in the closure means for mechanically transmitting a direct downwardly digitally powered movement to the lower slidable seal means, said downward movement being sufficient in length to exit that seal means out of the lower end of the upper compartment but not sufficient in length to allow the linking means or lower seal means to fall out of the upper compartment and into the lower compartment;
- (f) an upper slidable seal means disposed around the said linking means and contacting a perimeter side wall portion of the upper compartment near the upper end thereof, whereby an upper chamber for holding the contents of the upper compartment is formed between said lower and said upper seal means and the walls of the upper compartment;
- and
- (g) a positive stop means for abruptly stopping the downward movement of the mechanical linking means and, hence, the lower seal means;
- wherein the linking means may be quickly and directly digitally depressed, the lower seal means quickly exits from the lower end of the upper compartment, the contents in the chamber of the upper compartment quickly project from, and at least in part, abruptly impinge upon and deflect from the lower seal means and skirt, whereby the contents of the upper compartment are more uniformly dispersed into the contents of the lower compartment.