Strong yet flexible, the Hydro Flask Cap Flex Small 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 hours. Pair it with any of Hydro Flask's Standard Mouth Bottles for a durable way to take your favorite drinks on-the-go.