Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Standard Flex Straw Cap by Hydro Flask Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $12.95 Black / One Size - $12.95 Color Black Size One Size Availability: Translation missing: en.general.icons.icon_check_circle icon 53 in stock, ready to be shipped 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Looking for Local Pick-up? Choose a store below. Product Locator by Locally Notify me when back in stock Email address Email me when available Hydration on the go just got easier with our leakproof, insulated Flex Straw Cap. Add it to your favorite Standard Mouth Hydro Flask bottle to easily enjoy cold hydration anywhere.