A green accounting method called “mass balance” certifies that something was manufactured with recycled plastic — just not necessarily much of the bottle making the claim.

The plastic CamelBak bottles displayed in a Target in East Hanover, N.J., offer a promise to ecologically conscious buyers. On the front of each is a bright blue sticker with the words “Tritan Renew made with “50% recycled material.”

In reality, however, the amount of recycled plastic that went into making the bottles may be nowhere near 50 percent.

Eastman Chemical, a company with $9.2 billion in annual revenues based in Kingsport, Tenn., introduced the durable plastic called Tritan Renew four years ago, telling manufacturers it was made with “up to 50 percent recycled content from waste plastic.” It quickly caught on with companies trying to reach their sustainability goals or eager to appeal to consumers who want to keep plastics out of landfills and oceans.

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Keep reading this article on The New York Times Energy & Environment.