I bought these because I was tired of having sand in my teeth after every drink on the local trails. It's dry and dusty here. The lid will keep most of the dust/dirt in, but it's not airtight, so not everything. Enough that my teeth don't feel like I just put sandpaper in them anymore. Bottle and cap are good, the plastic cap is a bit brittle when unscrewing it from the side. I broke a cap after a full bottle fell on the cap. I just removed the cap and am now using the bottle on the simulator. I will buy more when these retire.
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