’’I found this inside a drawer in my parents’ house. No one knows what it is or how it got there. The pouch is soft and flexible and is filled with some kind of red gel or liquid.’’
Answer: "It is a reusable heating bag/pad. Try squeezing the inner component; it will trigger a chemical reaction, causing the fluid to solidify and produce heat. After it cools down, you can boil it to return it to a liquid state, making it ready for reuse."