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Everyone needs to stay hydrated on the move, but there are plenty of occasions where lugging a heavy, rigid metal bottle around spoils the moment (at festivals, for one) – and that’s if you even have space for it to begin with. Enter the foldable water bottle: the ultimate space-saving solution for frequent flyers, distance runners, and ardent campers. These clever containers are typically made from flexible, BPA-free silicone or lightweight TPU, meaning they collapse down into…
