Closure cap and combination of a closure cap and reusable container

A closure cap for closing the neck of a reusable container, comprising:

• a circular top plate,
• a cylindrical threaded part surrounding the circular top plate and having an open edge and an internal thread,
• an inner seal protruding from inside of the circular top plate and extending concentrically, which includes a base and a sealing section adjoining the base and extending radially outwards, and
• an outer seal protruding from an inner transition from the circular top plate to the cylindrical threaded part and extending concentrically, which extends radially inwardly and downwardly,
• wherein
• the sealing section seamlessly connects to the base, the sealing section having a cross-section which tapers continuously toward an open end.

In combination:

• a closure cap for closing the neck of a reusable container, comprising:
• a circular top plate,
• a cylindrical threaded part surrounding the circular top plate and having an open edge and an internal thread,
• an inner seal protruding from inside of the circular top plate and extending concentrically, which includes a base and a sealing section adjoining the base and extending radially outwards, and
• an outer seal protruding from an inner transition from the circular top plate to the cylindrical threaded part and extending concentrically, which extends radially inwardly and downwardly,
• wherein the sealing section seamlessly connects to the base, the sealing section having a cross-section which tapers continuously toward an open end;
• and
• a reusable container comprising a neck and an interior surface and an exterior surface having formed thereon an external thread,
• wherein the external thread of the reusable container operatively couples with the internal thread of the cylindrical threaded part.