The Glass Lunch Pot by Black Blum is modern with a touch of practical retro charm. The combination of stainless steel and a base made from wood fiber polymer for glass protection is a beautiful material choice. The result is innovative and offers a sustainable, functional solution that is built to last.What makes this lunch box even more convenient is the silicone lid with a clever vent valve. This allows the lid to stay in place during microwave or oven heating, preventing splatters.The inner container is made of hand-blown, high-quality borosilicate glass. This glass is lightweight, strong, recyclable, and stain-resistant.The base is made of polypropylene and includes 30% sustainably produced wood fibers. It also features a silicone ring to protect the glass from drops and prevent the base from slipping on vibrating surfaces, such as train or airplane tables.- BPA-free- 100% leak-proof- Dishwasher safe- Safe for oven and microwave use- Freezer-safe