Last year a member of my local Zero Waste group on Facebook asked if she should do bulk bin shopping in the context of living 20 miles away from the nearest store to offer it. Commentators on the post agreed that it probably was not a good idea. The additional miles driven would likely have a larger carbon footprint than the amount of plastic saved. 

I wondered if there is a way to express miles driven as a quantity of single-use plastic. Here is my best ballpark estimate:

1 mile driven = 5.3 standard size plastic water bottles