It's a bit of a hike from my classroom to the nearest water fountain. With back-to-back-to-back sessions, the idea of walking to get a drink, or even refilling a more normal bottle is too much. I also really appreciate the crisp taste of filtered water. Enter the Pur 7. It's been a good buy for me so far. It's easy to clean, easy to cary, easy to fill. The water inside tastes good and keeps me refreshed all day.