evo.com | Hydro Flask Water Bottles > Oh no, lost the lid for your favorite Hydro Flask bottle? Don't despair, the Hydro Flask Wide Mouth Flex Cap is here to keep that baby going strong. Fits all Hydro Flask wide mouth bottles. Compatible with all Hydro Flask Wide Mouth Bottles BPA-Free and Phthalate-Free Honeycomb Insulation | Hydro Flask Wide Mouth Flex Cap 2020