We choose plastic jars for three reasons: Glass doesn’t allow gases to release – our BPA-free plastic containers let carbon dioxide out but no oxygen in. They are also rated PET 1, one of most highly chemical resistant, recyclable types of plastic available. Our jars are lower in weight, saving on fuel and greenhouse gases during shipping. Glass is very expensive, and plastic containers allow us to sell our product at an affordable price. In addition, some retailers ask us to refrain from glass for breakage reasons.