No 3s or Vs here. Let's pick a good, accredited source, shall we? "Heating pads releasing the toxins faster?" Doubt it.

Okay.
TupperwAre = small container used for food. It's a brand name. Like "plasticine", which I remember you used at some point. It has nothing to do with what we keep our animals in.
Tub = a large bin, generally clear, with holes and good enough ventilation, that we do keep our animals in, and apparently not made of any of this any so-called killer plastic.