These items arrived feeling very "hot". I have used oxygen absorbers many times, I know one of the signs they are activated when you remove them from their sealed package and they are exposed to air, is the heat they generate in the chemical process of activation. Also, the packets "feel" different after activation, they become stiff and hard. This order arrived hot and cooled off the next morning to be stiff and hard, while still in their sealed package. I do not know how this may have happened. Something wrong with the shipping process? Faulty mail handling? The package appeared to be sealed and not damaged. Anyway, I will try ordering from a different shipper.