Is it safe to cook food in plastic bags?

Chef's answer
Bags and wraps made form polyethylene are generally microwave-safe, whereas those that contain polyvinyl chloride plastics generally are not. Many professional kitchens use clear, rigid, plastic storage containers that are made from polycarbonate.
Frequently asked Questions 🎓
Sous vide manufacturer ChefSteps recommends using food-grade vacuum sealing bags because they're BPA-free and made of polyethylene (we like the ones made by FoodSaver). These bags need to be sealed with a vacuum-sealing system, which FoodSaver also makes.14 Feb 2018
To get started with sous vide, regular old ziplock-style bags will do just fine. In fact, in some applications they are preferable to vacuum-sealed bags. Plus you can use high-grade bags intended for vacuum sealers without sealing them. More on that below.
You can use one bag if all steaks are in one layer, or you can choose 4 separate!18 Aug 2017
To get started with sous vide, regular old ziplock-style bags will do just fine. In fact, in some applications they are preferable to vacuum-sealed bags. Plus you can use high-grade bags intended for vacuum sealers without sealing them. More on that below.
Look for bags made from high-density or low-density polyethylene and/or polypropylene. They can't be boiled, but are food safe (and won't melt) up to about 195F. (You wouldn't sous vide at that high a temperature anyway.) Ziplock and Glad brand bags are made from polyethylene plastic, and are free of BPAs and dioxins.
Sous vide is French for "under vacuum." And yes, it's a very confusing name. ... To get started with sous vide, regular old ziplock-style bags will do just fine. In fact, in some applications they are preferable to vacuum-sealed bags. Plus you can use high-grade bags intended for vacuum sealers without sealing them.
Once your bags are securely submerged, you're good to go, and there is almost no limit to the things you can sous vide. (If you need suggestions, we have quite a few.)16 Jan 2017
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