From mountain trails to morning yoga class, our Standard Mouth Insulated Sport Cap lets you hydrate one-handed and on the fly. It’s the first insulated sport cap specifically designed to keep water in your Hydro Flask bottle ice cold, sip after sip.
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 up to 12. Pair it with any of our 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
Standard Mouth Stainless Steel Flex Cap
Pure refreshment in an easy to carry stainless steel insulated cap. Fits all Hydro Flask Standard Mouth bottles.
18/8 pro-grade stainless steel cap for pure refreshment
The flexible strap is easy to transport and comfortable to carry
Insulated stainless steel cap for maximum temperature retention