Boom Hot Eco Flask This thermos flask with a beautiful form is made of stainless steel. The bottle has a double wall, this wall is between the drawn vacuum. Because of the Cradle to Cradle technology, this product is produced sustainably. The thermos bottle is BPA free and the thermos flask is recyclable. You can choose to print the bottle with your own design or logo design. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. The bottle is gray, the color of the cap is blue, lime green or gray. The bottle has a screw on lid so you can drink through the drinkhole.