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Plastic use in commercial kitchens is pretty high too. Taking boiling hot food and putting plastic wrap over it or putting it in a plastic container is pretty common. With sous vide the food is cooked inside a brand new plastic bag. The only way to avoid it is to be fanatical.

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Only speculating but something tells me mineral water is often bottled while it's at still hot.

I didn't know what sous vide is. According to the wiki article, containers are either plastic or glass. It boggles the mind. Why would anyone cook in a plastic container

I imagine because it’s easier. The plastic doesn’t soak up as much of the heat and is easier to shift around and takes up less space

Sous vide is long waterbath at around 55 C or lower. Not a typical plastic safety issue temperature.

Cooking in plastic (or any "original package") has a food safety point in restaurants. Keeping it sealed until the outside is sterilized reduces possible contamination. Immersion also makes for easier and faster heating.

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