Cap for travel toothpaste tube with integrated refill adapter

A cap for a travel toothpaste tube, the cap comprising:

• a refill adapter, having a hollow tube shape, comprising a first end having a first screw groove formed on an outer circumference thereof and a snap-fastening structure with a plurality of slits for enabling a nozzle of a large-capacity toothpaste tube to be engaged with the snap-fastening structure, and a second end having a screw-fastening structure for enabling a nozzle of a travel toothpaste tube to be engaged with the screw fastening structure, thus allowing the travel toothpaste tube to be refilled with toothpaste from the large-capacity toothpaste tube;
• and
• an upper cap comprising a cylindrical-shaped snap-fit that protrudes downwardly from an inner surface of the upper cap, a handle extending downwardly in a skirt shape from a top of the cylindrical-shaped snap fit, and a second screw groove formed on an inner circumference of the upper cap, wherein
• the cylindrical-shaped snap fit is enclosed within the handle of the upper cap;
• the handle of the upper cap is configured to cover the first end of the refill adapter in order to provide a seamless appearance in response to the upper cap being engaged with the refill adapter;
• the plurality of slits of the snap-fastening structure are flexible and have a plurality of gaps therebetween which widen in response to the refill adapter being engaged with the large-capacity toothpaste tube;
• the first screw groove of the refill adapter is configured to engage with the second screw groove of the upper cap for securing the refill adapter to the upper cap;
• and
• each of the plurality of slits has one of a plurality of teeth configured to snap onto the cylindrical-shaped snap fit to secure the refill adapter to the upper cap, or to snap onto a protruding boundary on the nozzle of the large-capacity toothpaste tube to secure the refill adapter to the large-capacity toothpaste tube.