Your reusable coffee cup might not be so green after all
They found that some reusable alternatives never manage to reach that break-even point because of the energy and water used each time a reusable item is washed.
...
On the positive side of the ledger for reusables, nine of the 12 reusables were able to reach the break-even point, even when washed after every use.
I am probably still mad about all the straws hype.
For example, reusable bamboo drinking straws and two reusable sandwich storage options — beeswax wrap and silicone bags — never reached the break-even point in any of the three environmental impact categories assessed in the study: energy use, global warming potential, and water consumption.