Glass is the safest alternative to plastic baby bottles. Even BPA-free plastic bottles may leach toxic chemicals.
Glass can last for ages and generations, where as plastic bottles has to be replaced every now and then.
Glass bottles are more thermal and will keep the content warm or cold for longer time.
Glass is so much easier to clean.
Borosilicate glass is the type of glass that resists temperature chock best, extreme temperatures and a more light (not heavy) type of glass.
It’s very resistant even to scratches and has good hygienic features. That’s also the reason that it’s the glass type chosen for laboratories.
It’s free of BPA, phthalates, polycarbonates, plastic, latex and polyvinyl chloride (PVC).