The invention of “ovenable materials” like those used in CPET trays changed how we eat pre-prepared frozen meals. The original frozen meals were packaged in metal trays that had to be heated in the oven. With CPET trays, we can put a tasty meal in the microwave and have a nutritious meal anytime. This enables both time-savings and energy-savings since microwaves use only a fraction of the energy used by an oven.