While I appreciate the effort I find that plastic is an excellent way of reducing food waste which environmentally should have a larger impact than the packaging itself [1]. Glass bottles vs. plastic ones also seems like a fairly straight-forward issue, the energy required for transport and the fact that they sometimes break doesn't seem to be worth the perceived re-usability. Either way, an experiment like this seems to be a good way to find just how dependent we are on plastic/packaging rather than trying to be kind to the environment on a macro scale.

[1] https://www2.mst.dk/Udgiv/publications/2018/02/978-87-93614-...