The “paper or plastic” conundrum that vexed earnest shoppers throughout the 1980s and 90s is largely moot today. Most grocery store baggers don’t bother to ask anymore. They drop the bananas in one plastic bag as they reach for another to hold the six-pack of soda. The pasta sauce and noodles will get one too, as will the dish soap.

Plastic bags are so cheap to produce, sturdy, plentiful, easy to carry and store that they have captured at least 80 percent of the reusable grocery bags and convenience store market since they were introduced a quarter century ago, according to the Arlington, Virginia-based American Plastics Council.

As a result, the reusable bags are everywhere. They sit balled up and stuffed into the one that hangs from the pantry door. They line bathroom trash bins. They carry clothes to the gym. They clutter landfills. They flap from trees. They float in the breeze. They clog roadside drains. They drift on the high seas. They fill sea turtle bellies.

“The numbers are absolutely staggering,” said Vincent Cobb, an entrepreneur in Chicago, Illinois, who recently launched the Web site http://www.onebagatatime.com to educate the public about what he terms the “true costs” associated with the spread of “free” bags. He sells reusable shopping bags as a viable solution.

According to Cobb’s calculations extrapolated from data released by the United States Environmental Protection Agency in 2001 on U.S. plastic bag, sack, and wrap consumption, somewhere between 500 billion and a trillion plastic bags are consumed worldwide each year. Of those, millions end up in the litter stream outside of landfills—estimates range from less than one to three percent of the grocery bags.

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