I have 2 Camelback groove water bottles and I love them. In fact, I loved them so much each of my friends rreceived one as a Christmas gift. In this day and age of over use of plastic bottles and reuination of our ecology it is our duty to limit waste. I purchase filters twice a year on Amazon.com, change the filter about once every 3 months. Do not place anything but water in these bottles, the filter is not meant to handle anything else. I even bought the smaller sizes for my grandchildren, they do not come with filters as they use it for their juice. We use Filtered water pitchers for our teas and coffee, but the camelback bottles go every where with us. I even use it when traveling abroad although I suggest you boil all water first and cool to room temp or in a refrigerator. The price is phenomenal at 14.99 for 2, I paid 19.99 for one. I am ordering 3 sets for my future use and for gifts. Being aware of wasteful water bottles and BPA, not to mention that water in a bottle has an expirration date, you do not know how long water has remained on store shelves, what temperature changes it has been exposed to or the safety of the container. This way, I know my water is from a fresh source.