Wrench Lid: Comes with a portable PP lid. can open it easily. How to Open Quickly: 1. Lay flat and hold small circle of wrench. 2. Pull the wrench up to 90 degrees. 3. Due to vacuum insulation, hold the wrench and press down 1-2 times to let the air In. 4. Remove lid easily. (Note: Don't let the internal rubber stopper get stuck in the lid)..Keep Food Warm for a Long Time: Apply double-wall vacuum insulation. At room temperature, keep soup hot for 6 hours, cold for 12 hours. , reusable option for to-go beverages. Capacity: 8oz(240ml). Small size and light weight, suitable for home, work or picnic etc. How to preheat food more effectively: fill it with boiling water for about 5-8 mins first to get it good and warm..Leak Proof Silicone Gasket: Our thermo comes with a silicone gasket. It is full sealed. Use it for meals such as pasta, chili, casseroles, milkshake and salads. Make your life very convenient..Thickened Shock Proof Material: Made of food grade 304 18/8 stainless steel and lid is made of PP plastic, which can prevent from breakage or deformation, BPA Free.. Stainless Steel Outsole: The outsole adopts a concave design, which can be placed on the table stably without deformation after high temperature. No rust, no odor. Easy to clean. Dishwasher . Not microwaveable.