All the plastic materials used are absolutely safe for human health.
Outer can and caps are made from plastic named ABS POLYLAC PA-777D, it is a popular non-BPA hard plastic with high durability and glance, used widely for kitchen wares, dishes and toys.
Internar transparent can is made from PS POLYREX PG383 – exactly from this material the children's milk and water bottles being made, it is also non-BPA.
All the material were tested thoroughly by 2 independent labs: international branch in China and state laboratory in Russia. You could check these documents and test protocols.