In fact, you should think twice about buying olive oil in clear plastic bottles — like Kirkland Signature olive oil — which is a big no-no when you're looking for packaging that blocks light.

If you buy your olive oil in bulk, you've likely been in for a shock in recent weeks. Major supermarkets have been selling olive oil for up to A$65 for a four-liter tin, and up to $26 for a 750 ...