I needed a refillable water bottle since I am on a diet that consists of drinking at least 8 cups of water a day. I was reusing my poland Spring bottle for a few days and replenishing it with another one, which I know is supposedly horrible for you. So when i needed some items I went to Birchbox and saw this. I've been using it for a week so far. Its awesome. Its dishwasher safe, which is nice because then you can kill all the bacteria and not wash it with a sponge by hand every day. It covers all my necessities, office, gym, etc.