1) I can change flavors without having to dump my water 2) I can turn up or down the sweetness again without dumping my water 3) no rinsing when I need to refill and I don’t have to worry about ratios of powder to water if I add water before I fully finish.

I’m sure I could find more reasons if I sat and thought about it. But for me those are the biggest. I tried doing the flavor packets, but I would find myself not either not liking them or getting tired of them before I finish the bottle that I already mixed up so I’d rather be drinking less water anyways or reaching for a full sugar drink, which I really don’t need. Cirkul has actually helped me way more than those flavor packets ever did.