Collapsable containers Save time with these amazing and versatile containers that can go right from the freezer into the oven without damage! Made from durable BPA free, heat safe, medical grade silicone. These containers wonï ½t break or crack like traditional containers, they just flex. Each container collapses for easy storage. Great for everyday use, as well as work or school lunches. Stain and odor resistant. Dishwasher safe.