Inside Seattle’s attempts to embrace reusable packaging

And why it’s so hard to scale up these efforts nationwide.

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. Customers could simply borrow a cup from Tailwind, go on their way, and then at some point—perhaps a few hours later, perhaps on another day that week—return the cup to the shop, which would clean it and refill it for the next person. If it wasn’t returned within 14 days...