Safe & Non-toxic : This water bottle made of high quality 316 medical grade stainless steel and BPA free straw lids, free from toxins and harmful chemicals, ensure that every sip of water you drink is healthy. This flask goes everywhere easier whether you need cold water or ice Vacuum Insulation: Our condensation-free exterior prevents your flask from sweating, double wall vacuum insulation design, great retention performance keeps your drinks cold/hot for an incredible amount of time, making it the perfect sports or commuting flask Leak Proof: Our water bottle uses food grade silicone o-ring makes sure the sealing tightness and leak proof. pack your thermos flask in your school bag, backpack or travel luggage without worrying about spills or leaks. Please note that it is leakproof only with the lid closed Bounce Straw Lid: Button design, you can easily open the bottle with one hand and drink in time, you can enjoy spill-proof sipping with straw. Suitable for running, climbing, traveling, cycling, yoga, camping, school, office, gym, at home and other occasions Silicone Bottom:The bottom of our flask is designed with silicone, so you don't ding furniture or constantly hear clunking. If you have any questions, please feel free to contact us. We will provide you with the best solution