What is the correct design for a tottle bottle to allow inverted storage?

What is the correct design for a tottle bottle to allow inverted storage?

Cosmetic Bottle
Tottle bottles combine the features of tubes and bottles. They work well for lotions, gels, sunscreen, and insect repellent. The design allows for ...
Squeeze tottle bottles with flexible bodies and dispensing closures for skincare, sunscreen, and personal care products.

What is a squeeze tottle bottle?

Cosmetic Bottle
A squeeze tottle bottle is a flexible cosmetic container that combines the squeezable body of a tube with the shape and structure of a bottle. It i...