Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Standard Flex Straw Cap by Hydro Flask $12.95 Black - $12.95 Black Color Chevron down icon Availability: translation missing: en.general.icons.icon_check_circle icon Only 3 left! 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.