I use them on sandwiches and salad dressings, they protect food and don't leak. They're also lightweight yet strong so they don't add weight to my lunch bag, unlike my glass containers. There are no problems with the reaction as they are made of stainless steel. Of course, you can't use them in the microwave, but for anything that's room temperature, like sandwiches, or ones you want to keep cold, like a salad, they're great at protecting food and the bag you put them in. without adding much. Weight.
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