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For several months last year, patrons of a Seattle coffee shop called Tailwind Cafe had the option of ordering their Americanos and lattes in returnable metal to-go cups.

“Any version of a 2020 rover mission that does not prepare a returnable cache would seriously delay any significant progress toward sample return,” it noted.

I buy milk in returnable glass bottles, and I take jars to places where I can get cooking oil in bulk.

Loop, for example, helps its corporate clients set up the "reverse logistics" infrastructure that forms the backbone of returnable packaging systems.

In addition to shrinking can sizes or offering cheaper, returnable bottles in some markets, Coke has has been promoting more expensive products, like soft drinks in slimmer cans.