Fifty/Fifty's 40oz vacuum-insulated water bottles keep liquids hot or cold all day. This larger volume is designed for all-day hydration while you hop from work to the gym to a happy hour meet up. It's the ideal size to bring extra liquids when you won't have access to easy refills.Read more
Stainless Steel Versus Aluminum
Aluminum can leach into water and therefore aluminum water bottles require a plastic or epoxy lining. Fifty/Fifty's bottles are made from food-grade stainless steel which does not leach so our bottles do not require a lining.