We feel it’s safest to know exactly what is coming into contact with your water. This is why safe, non-leaching, and durable 304 grade stainless steel is used.
Aluminum is known to leach various chemicals, which are bad for your health. To counter leaching, many aluminum bottle companies will line the inside of their bottles with an epoxy, ceramic, plastic, or other unknown coating. These coatings have been known to leach or crack over the life of the bottle.