They dangle from the arms of many New Yorkers, a nearly ubiquitous emblem of empathy with the environment: synthetic, reusable grocery bags, another must-have accessory for the socially conscious. But the bags, hot items at upscale markets may be on the verge of a glacier-size public relations problem: similar bags outside the city have been found to contain lead. 'They say plastic bags are bad; now they say these are bad. What's worse?' asked Jen Bluestein, who was walking out of Trader Joe's on the Upper West Side with a reusable bag under her arm Sunday. 'Green is a trend and people go with trends,' Bluestein said. 'People get them as fashion statements and they have, like, 50 of them. I don't think people know the real facts.' There is no evidence that these bags pose an immediate threat to the public, and none of the bags sold by New York City's best-known grocery stores have been implicated. But reports from around the country have trickled in recently about reusable bags, mostly made in China, that contained potentially unsafe levels of lead. The offending bags were identified at several stores, including some CVS pharmacies; the Rochester-based Wegman's grocery chain recalled thousands of its bags, made of recycled plastic, in September. Concerns have proliferated so much that Sen. Charles E. Schumer, D-N.Y., sent a letter on Sunday to the Food and Drug Administration, urging the agency to investigate the issue. 'There's always something wrong with everything,' said Barry Lebost, standing outside a Trader Joe's in Manhattan with four reusable bags filled with groceries. But Lebost, an alternative energy consultant, did not appear fazed by the revelations of lead. He said his home, in Gardiner, N.Y., had been outfitted with a hydroelectric plant that saved the energy equivalent of 200 plastic bags a day. 'It may not be a total solution, but this is a step in the right direction,' he said of the suddenly suspect bags at his feet. 'The fluorescent bulbs we have now, they're no good because they have mercury in them. You look at it as a transition.' But many shoppers said they would continue relying on the bags until more information came out. 'I wasn't planning on throwing it out, so that's a positive thing,' said Catherine Paykin, standing by the meat counter at Fairway. 'As long as I use it and don't throw it away, that will be my plan.' 