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Will this work with a 18 oz hydro flask standard mouth.
Yes, the straw can be cut down to fit the size of any bottle. I have a 24oz hydroflask, works great.
If you choose the standard it should work fine. Mine is standard opening, I don’t know the oz, but it works great. Hope this helps.
It fits the COLDEST WATER standard bottle.
Yes, the 18oz also has a standard mouth, therefore being perfectly compatible!
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