The award-winning CrazyCap® twin pack self-cleaning bottles ensures water is safe to drink in as little as 60 seconds with its deep UV LED sterilization technology. This makes drinking water safe/potable from anywhere in the world. It's perfect for hiking, traveling, or a day at the office. It also works on surfaces such as a shared workspace, mobile phone, or computer. Patented port-less USB 360 ° charging technology ensures the integrity of your CrazyCap®. The bottles are vacuum insulated, self-cleaning, and made of 304 grade stainless steel. This twin pack comes with two 17 oz bottles that are also eco-friendly.