To me, the most ideal bottle would be that glass bottle. However, glass bottles are breakable and fragile. Not practical especially for older kids.

Recently came across a new brand of feeding bottle: Safety plus. It is made of Polyethersulfone (PES). PES is a thermaplastic which can withstand high temperature up to 356 degree Fahrenheit. It is transparent, tough and durable. This material is compatible if not more superior than PC. Most importantly it is safe. It does not leach BPA. This bottle passed the quality testing by SGS in Taiwan. It also compliant with EN 14350, an international safety standard. The paint used on the bottle does not contain lead. The price is also reasonable.