Aluminium is light weight metal which can leach when it gets hot or comes in contact with anything acidic. Aluminium exposure has been linked to Alzheimer’s disease. To safeguard the liquids inside aluminium bottles they have to be lined.
Common materials used to line these aluminium bottles include plastic resins or epoxy, some of which can leach BPA and other chemicals or can even get scratched, cracked or damaged exposing the aluminium underneath.
The stainless steel used to produce a PUNC bottle is completely non toxic and BPA-free. PUNC bottles do not contain phthalates, lead and other harmful substances. They can be filled with acidic drinks and do not retain or effect flavour.