Nearly all soft drink packaging, whether glass bottles or aluminum cans, is cylindrical. But the milk carton such as 500ml Glass Dairy Milk Bottle With Cork seemed to be square. Square containers make more economical use of shelf space than cylindrical ones. So why do soft drink makers stick with cylindrical containers?
One reason may be that soft drinks are mostly consumed straight out of the container, so the extra storage costs are offset by the more hands-like cylinders. That's not the case with milk, which most people don't drink straight from the box.
But even if most people drink milk straight out of the box, the cost-benefit principle suggests they are unlikely to be sold in cylindrical containers. Yes, square containers (whatever they contain) do save shelf space, but the space saved in a milk case is clearly more cost-effective than in a soft drink case.
Most soft drinks in supermarkets are kept on open shelves, which are cheap and usually free of operating costs. But milk needs to be packed in a freezer, which is expensive and expensive to run. So the storage space in the freezer is valuable, boosting the benefits of having milk in a square container.
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