Shampoo bottle upside down stand ("Schauma" size*)

This shape, which morphs between different ellipse crosscuts) is special and may not fit other brands than "Schauma" (quite popular in Germany). So if you have a similar bottle: fine, it should not wiggle or fall over any more when you are trying to drain the last drops out of it.

[* Disclaimer: "Schauma" is a trademark of Schwarkkopf / Henkel AG & Co. KGaA, Düsseldorf, Germany]