Most travel mug lids have a rubbery seal made of polypropylene, a food-safe plastic that has a high tolerance for ...

Most travel-mug lids have a rubbery seal made of polypropylene, a food-safe plastic that has a high tolerance for heat—including the type of heat it receives in the top rack of a dishwasher.

that they ended up needing to confirm with their product team that both the plastic lid and the vacuum-sealed bottom could go into the machine. For years, I've used a Vessel Drinkware travel mug I ...