Fully eversible beverage receptacle

A receptacle for containing a substance comprising:

• at least one elastomeric sidewall having a contoured non-linear shape defining a container having a first surface, the container being reversibly eversible between first and second stable conformations, the first stable conformation defined by the first surface facing inward, and the second stable conformation defined by the first surface facing outward, the at least one elastomeric sidewall having resilience, wherein each of the first and second stable conformations is sufficiently stable to stand upright with no additional support, and having sufficient yield strain to prevent permanent deformation and fatigue failure of the elastomeric sidewall after repeated eversions;
• and
• a buckle region of the sidewall extending peripherally adjacent to a lower portion of the container allowing the buckle region to strategically deform making eversion of the container easier.

A receptacle for containing a substance comprising:

• a containment element including a contiguous containment wall having a contoured non-linear shape defining an open end, the contiguous containment wall having a first surface, the containment wall being composed substantially of an elastomeric material, the containment element being reversibly eversible, wherein the containment element reversibly transforms between a normal stable conformation with the first surface facing inward, and an everted stable conformation with the first surface facing outward, wherein each of the first and second stable conformations is sufficiently stable to stand upright;
• and
• a buckle region of the sidewall extending peripherally adjacent to a lower portion of the container allowing the buckle region to strategically deform making eversion of the container easier.