Classic packaging. The Egg Box.

One of the most environmentally friendly packaging containers sold today is the egg box. It is made from paper pulp and was introduced in the 1930's. Its design has not changed much since then.

It was replaced for a while with PET packaging but the public preferred the natural look and feel of the paper pulp carton. It was even replaced at one time with expanded polystyrene (the same materials as McDonalds burgers are packaged in).

Recycled paper needs a high quality surface, which is achieved by bleaching the surface. As we know bleach is not environmentally friendly and if it enters the water source can cause damage to the environment.

Pulp on the other hand does not require this quality surface but instead is used with a textured, natural surface.
This material is chemical free and is much more environmentally friendly than the plastic PET alternative.

The egg box is a shell or Monocoque structure. It does not have a frame. It relies upon the shape that it has been moulded into to give it its strength. Monocoque structures are designed to be both light and strong.
The egg box is made from thin sheet material, yet it is surprisingly strong. It is the folds and curves that give it it's strength.