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As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of packaging milk in tetrahedral containers:

Practically speaking, there is another criterion that is important: the surface should unfold flat to a polygon that tiles the plane, so that they can be cut out easily. Of course the regular tetrahedron unfolds to an equilateral triangle, but also to a $2 \times 1$ parallelogram; I wouldn't be surprised if Tetra Pak used the latter.

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As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of packaging milk in tetrahedral containers:

Practically speaking, there is another criterion that is important: the unfolded surface should tile unfold flat to a polygon that tiles the plane, so that it they can be cut out easily.

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As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of packaging milk in tetrahedral containers:

Practically speaking, there is another criterion that is important: the unfolded surface should tile the plane, so that it can be cut out easily.