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 drinks cold for up to 24 hours or hot for up to 12. Pair it with any of our Standard Mouth bottles. Features 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.