Prepare, serve and store in the same container. These tempered glass containers are oven safe up to 450 degrees F (without the lids). They're pretty much indispensable in our kitchen as they are resistant to scratches, odors, and discoloration. The seal and lid are fused together, so no dirt or bacteria can be trapped underneath the seal. Leak proof, airtight, and aroma safe (and certified baby food safe!) -- is there anything they can't do?