Mermaid Gold 500 ml thermos flasks are the perfect replacement for plastic bottles. Did you know that with one Saywhat Bottle you save no less than 167 plastic bottles per year? Our double-walled thermos are made of 304 stainless steel (SS), a durable and environmentally friendly material that is well resistant to rust. This keeps your drink in the Saywhat Bottle cold for up to 24 hours or warm for up to 12 hours. In addition, stainless steel does not retain odors and/or flavors, it is easy to keep clean and the thermos flask is leak and BPA free. This makes the Saywhat Bottle ideal for on the go, at the office, at school, during sports or when you go on holiday. Please note: the Saywhat Bottles from the Mermaid Collection have a Glitter Coating. Sustainably packaged The Saywhat Bottle Mermaid Gold comes in a Bottle Bag and cardboard tube. This Bottle Bag protects the thermos during shipment, but can also be used in everyday life. This prevents the Saywhat Bottle from being damaged, for example in your bag. The cardboard tube in which we supply our bottles is made from recycled cardboard and is fully biodegradable. \Cleaning your Saywhat Bottle The Saywhat Bottle is not dishwasher safe. We recommend that you clean the Saywhat Bottle with warm water, (soap) and a bottle brush.