Hydro Flask Standard Mouth Flex Cap

Strong yet flexible, our Standard Mouth Flex Cap is the perfect companion for spontaneous campouts, epic road trips, and everything in between. Made with stainless steel pivots and an easy-to-carry strap, this cap has Honeycomb Insulation™ to help keep your cold drinks cold for up to 24 hours and hot drinks hot for up to 12. Pair it with any of our Standard Mouth Bottles for a durable way to take your favorite drinks on the go.