evo.com | Hydro Flask Water Bottles > 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. 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. Compatible with All Standard Mouth Hydro Flask Caps and Lids BPA-Free and Phthalate-Free | Hydro Flask Standard Mouth Flex Straw Cap 2022 in Black