Strong yet flexible, Hydro Flask&';s 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 drinks cold for up to 24 hours or hot up to 12. Pair it with any of Hydroflask&';s Standard Mouth bottles.