Containers like this feature a compound curve and also require wall-to-wall squeezability based on the types of liquids they normally contain. Typical example is hair conditioner containers, that are made of HDPE and are wall-to-wall squeezable due to the higher viscosity of the product.
Typical example is a tottle, which is wider at the bottom. Full squeeze is needed at the bottom where the curve is wider. Compound two or three dimensional curves require high material flexibility.
For this container type, we would recommend: Raflex MDO materials.