Health risks are derived from the fact the bisphenol-a can mimic estrogen. Perhaps this explains why hippies are such smug bi-yatches..
Either way, I recently acquired a sigg.ch bottle. There is a huge difference in the taste of the water, it is really surprising. For those that say nalgenes don’t leave a taste ( I used to!) switch. And after a week, tell me that the water doesn’t taste different.