San Francisco cafes and coffee shops like Ritual Coffee Roasters, Salt And Straw, Andytown Coffee Roasters, and Equator Coffees have started, as of Wednesday, in the reusable-cup testing ground that will let patrons order their drinks in cups from Muuse, which was tapped by NextGen to pilot the multiple-use vessel effort in San Francisco.

Experts fromRecycling Advocates estimate that 50 million disposable coffee cups are used in the Metro area per year.  This equates to three million pounds of solid waste being generated and 6,000 metric tons of CO2 being generated. This is equivalent to almost 600,000 gallons of gas consumed, or 6 million pounds of coal burned for one year.

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For now, the pilot is extremely limited: each coffee shop has agreed to a one-month contract with Muuse, and only four locations are participating: The Andytown at 181 Fremont Street, Equator’s 222 2nd Street shop, the Hayes Valley Ritual (432b Octavia Street) and the Hayes Valley location of Portland-based ice cream chain Salt and Straw (586 Hayes Street).

The start-up is backed by a number of conglomerates like founding partners McDonald’s and Starbucks, as well as Coca-Cola, Wendy’s, Yum Brands (which owns Taco Bell, KFC, and Pizza Hut), and Nestle.

Currently, the program is free to pilot if you’re interested in picking up a metal cup at any of the participating locations. But how does it work do you ask? Download and use the Muuse app to borrow a cup at one of their partner cafes. Customers scan the code on the bottom of the cup to check it out and receive a 25-cent discount. They can return the cup within five days to any partner café. Failure to return the cup results in a $15 fee. And don’t worry, Muuse cleans and sanitizes each cup for reuse. The startup has rolled out similar programs in Singapore, Bali and Hong Kong.

Have you given the program a try or seen it at your fave spot?

// Photography provided by Muuse, if you’ve tried the product, let us know on our Instagram—we want to hear your thoughts; muuse.io.