Stainless Steel Flask 1L The stainless steel vacuum flask 1 liter can be used to keep your coffee, tea or other beverages warm. The double-wall will keep your beverage at the perfect temperature. The bottle is available in two colors. The stainless steel vacuum bottle can be printed with your own design or logo. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. This makes it interesting to give away the stainless steel vacuum bottle as a promotional tool, for example to your customers or to your friends. On the inside, the material is polypropylene. The stainless steel vacuum bottle is free of BPA.