Purist has some cool plastic bottles with a glass liner: https://www.specialized.com/us/en/purist-watergate-water-bot...
They are lightweight and flexible and supposedly have minimal plastic contact with water.
They are lightweight and flexible and supposedly have minimal plastic contact with water.
"glass-like" != glass
Dollars to doughnuts that coating is spray lined. Which means some sort of solvent, at a minimum. And I'm unaware of any way to fuse silica at temperatures under which plastic would survive, so it's a coating with a binder (dissolved in the solvent) which can still be damaged, scratched, leach or flake off into the water.
I wouldn't touch it with a 10 foot pole. Glass, stainless steel (316 please), or ceramics for me.