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Your water bottle's original cap could be anywhere from Acadia to Yosemite, and instead of searching every rock on each peak, you're going to opt for Hydro Flask's Standard Mouth Flex Cap.

Honeycomb Insulation™ helps keep cold drinks cold and hot drinks hot
Easy press-in fit for splash-proof dependability
BPA-Free and Phthalate-Free
Pairs with our 32 oz Tumbler
Lifetime Warranty