Moves with you. 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 Hydro Flask's Standard Mouth bottles.

• Compatible with all Standard Mouth bottles
• Honeycomb Insulation helps keep cold drinks cold and hot drinks hot
• Durable, stainless steel pivots allow the strap to move easily
• BPA-Free and Phthalate-Free
• Lifetime Warranty