I used this product for travel and loved having it - it's so handy to be able to filter water anywhere on the go and pour it into other vessels or add electrolytes to the bottle. The one tricky thing was getting used to all the different pieces and how they fit together, I had multiple mishaps where the entire bottle spilled or leaked in my bag or on the plane. One I fully understood how all the pieces fit together and was able to make sure that each piece was properly screwed on etc, I didn't seem to have the problem. It does leak when under pressure though, either from electrolytes that fizz or from the pressure on an airplane.
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