The Hydro Flask Flex Sip was developed to be the best on-the-go beverage experience. The Flex Sip is your personal travel sidekick and goes where you go, making the seal and compact design paramount. As the rate of travel ever increases, the goal was to create a product that enables streamlined travel through silent open and closing movements, leak-proof seal, and an all-day comfort flex strap. The insulated vessel keeps beverages at the prepared temperature for hours while you navigate your daily commute, trail, or time zones.