[omnicognate]

They are currently, but only because we're crap at reuse. Glass bottles are highly reusable - 15 times or more on average - before they need to be recycled (i.e. melted).

Minimising the transport costs is part of the design of the reuse process. Milk floats are a great example of this. Milk delivered to the door by an electrical vehicle daily and empties collected by the same vehicle, washed and refilled. This was the standard way to get milk (and often juice, eggs, etc) in my childhood but nowadays people throw a plastic bottle into a generic recycling stream every time and I highly doubt it's an improvement.

Online grocery shopping reduces fuel usage and pollution for getting goods to homes by consolidating many deliveries in one vehicle round. It would be great to see this being used (again) as a way of improving packaging efficiency too, one way or another.