14 years of compliance experience and research has gone into our HazMat, DOT packaging and shipping practices. Our containers are HazMat, OSHA, DOT, CCOF, and NFPA approved containers that meet all legal and physical requirements to ship a UN1170 Class III flammable liquid, packing group 2.
We share your concern about plastics and we are, in the near future, going to be offering a metal container alternative, but the interest has been low because the cost of the container will be high and will likely add over $100 to the cost of an order. We have also done research on BPA-free plastics and have found that the information coming out now is showing that the chemicals being used to replace BPA may actually be more toxic than BPA.
The reason that the box says “overpack” is because the box is only there to keep the actual shipping/packaging container (a high-density polyethylene container or our one-gallon glass jug) from getting scuffed and dirtied and so that our product arrives in a presentable, professional, and hygienic fashion.
We do our very best to limit our negative environmental impact by contributing as little non-biodegradable, petroleum-based materials to our landfills as reasonably possible.
Packaging this way also offers the space to put all of the required labeling without cluttering up the high-quality, food-grade, fully reusable containers that we send to our customers.