After seeing how much harmful plastic is considered for microwaving food, Ziploc created a technology that makes it easier for people to reheat food. It is absolutely safe to use Ziploc bags in the microwave.
Similarly, you may ask, can you put hot food in sandwich bags?
Yes! Just use common sense and make sure it's not to hot to burn the plastic. I have never had an issue with Ziploc bags melting from hot food, but I guess it depends on how hot it actually is. If the food is straight out of a 400 degree oven, I'd say let it cool down for a few minutes first.
Subsequently, question is, is it safe to microwave food in plastic bags?
Don't let plastic wrap touch food during microwaving because it may melt. Old, scratched, or cracked containers, or those that have been microwaved many times, may leach out more plasticizers. Don't microwave plastic storage bags or plastic bags from the grocery store.
Are Ziploc bags safe for sous vide cooking?
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.
Why sous vide is bad?
Harmful bacteria can't grow above that temperature, and at around 135ºF, most bacteria will actually be destroyed after a few hours, making pasteurization possible. The precision temperature control of sous-vide cooking means it actually has the potential to be safer than traditional cooking methods.