Prior to embarking on the TA 2020i purchased 2 purist bottles from Ground Effect. Pretty blue they were. I was concerned after one particully Grueling mucky trail that the tops seemed to be collecting points for trail debis. Pleasantly surprised to find once the top was pulled up and drink squirted in the general direction of my mouth it was pure drink that arrived. ( Did i mention I was using Pure Sports Hydration) They worked real well, and I wou;ld recommend any Ground Effect products. Made by Cyclist for Cyclist.