I bought these bottles on Camelbak's advertised claim that they didn't leak on your bike frame and found that that was true. The bottles don't leak even when ridden over rough roads in the "unlocked" position. But they have a more serious problem: Mold grows inside the nipple and can't be rinsed or soaked away with a chlorine or vinegar solution, making the bottles useless. I would not recommend purchasing until Camelbak provides a solution to removing the mold.
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