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Take your hydration mobile with the Hydro Flask Standard Mouth Flex Straw Cap. This cool cap fits all standard mouth Hydro Flask bottles, bringing insulation, one-handed operation, and a leakproof seal.
BPA-Free and Phthalate-Free
Compatible with All Standard Mouth Hydro Flask Caps and Lids
Dishwasher Safe
Flex Straw Cap – Leakproof, insulated, and easy to use with one hand, this is Hydro Flask's easiest lid to access. Not intended for hot beverages.