Due to their durable platinum silicone material, these mighty Medium Containers can withstand extreme temperatures and can be reused over and over again. They're oven-safe up to 425 deg. F and work seriously well in a sous vide. They're also freezer safe. The Ziploc Endurables Medium silicone Container is an all-in-one solution to mealtime, designed to be continuously used, reused, then recycled. The possibilities are infinite. Durable, reusable silicone, Medium Container holds up to 4 cups and features a wide base with feet to help with standing and filling. Ziploc Endurables Pouches and Containers are made with food-safe silicone and not formulated with BPA or phthalates.