Hydro Flask Standard Mouth Flex Cap

See our Hydro Flask Selection Guide

Whether your outdoor adventures include bike riding by the beach or snowshoeing in the backcountry, our Flex Cap makes it easy to stay hydrated on the go. Designed with stainless steel pivots and a flexible, twistable strap, this cap moves when you do. Plus, it’s made with Honeycomb Insulation to keep cold drinks cold up to 24 hours and hot drinks hot up to 12 no matter what the weather’s doing outside.

• Fits all Standard Mouth Hydro Flask bottles
• All Hydro Flasks accessories are made of BPA-free plastics that are non-toxic and phthalate-free
• Designed for ultimate portability and easy-carry comfort. Insulated, flexible, and built to last.
• Honeycomb Insulation provides additional temperature control
• It's always good to have an extra cap at your disposal!