These Inno-Pak Edge #1 containers are made of Kraft paper that is poly coated on the inside. These containers can be used for hot or cold foods and are both microwave and leak resistant. This item is not compostable, but can bee recycled. Standard PE coated INNOBOX can be recycled in areas that take poly-coated paperboard in their recycling stream. The box should be wiped free of food waste before it is put in a recycling bin. Model #: 194830225-A #1 container Hot and cold Leak resistant Microwave Custom printing available Heat sealed Recyclable - check with you local municipality