Thanks for raising this @Kestrel, it’s great that you’re educating yourself. This issue has come up before and we have tested for BPF and BPS for our shaker. You’ll be glad to know all the samples tested came back with ‘not detected’ results.
The issue is also what would the alternative packaging be? For example, glass breaks easily and has a significantly higher carbon footprint than plastic. Metal has a much higher carbon footprint too and runs into issues around pollutants in the supply chain. Phil has done a useful post here around stainless steel.
You of course can use alternatives. Like blending Huel and pouring into a glass, this obviously removes a lot of convenience but I can’t think of many other ways to get around this? H&S you can obviously use a ceramic bowl.