These beautiful 500 ml stainless steel bottles, thanks to the innovative VacuumShield TM Technology, will keep your drinks for a long time: the double walls with the vacuum inside allow you to keep your drinks hot for up to 10 hours, while for those cold the temperature will remain stable even for 24 hours! Furthermore, the high quality of the steel makes these bottles completely airtight: not a single drop will come out! They are practical and robust and you can reuse them countless times, always carrying them with you during your daily activities: this makes them a more ecological choice than plastic bottles. The materials are all BPA and lead free: your drinks will only come into contact with the stainless steel, so as to prevent the transmission of odors and flavors. Tempflask bottles are designed with a wide opening, so they are easy to fill and, above all, to keep clean, preventing the growth of bacteria inside (they should be hand washed and air dried). Each of them is distinguished by a different pattern inspired by runes, ancient letters of the Swedish alphabet that were thought to be a gift from the Norse god Odin: the famous graphic designer Magdalena Lundkvist created several images describing the importance these symbols have for Sweden .