Caroline Tell / New York Times News Service

When Karl Lagerfeld introduced his ridiculously oversize hula-hoop beach bag at a Chanel runway show last month, he inadvertently struck a pop-cultural chord.

Among the most talked-about accessories to emerge from this season’s shows, the beach bag seemed to have tapped into a newfound affection for the hula hoop, as a fashion statement and an exercise device.

Anderson Cooper, on his recently canceled talk show, “Anderson Live,” presented a mock version of the bag — a quilted white case with handles made of actual hula hoops — to his co-host, Alexa Chung. A video of Lagerfeld explaining the bag (“It’s for the beach. You can put it into the sand and hang things on it.”) has been popping up on fashion sites like Fashionista and Styleite. And last week, Chanel announced that it would be selling smaller versions in stores.

Veteran hula-hoopers have long stood by its aerobic virtues.

“A lot of people are interested in hooping for its health benefits, which might get them hooked, but it’s also such a fun way to do cardio,” said Bex Burton, a hula hoop instructor who founded Sense of Motion, a Brooklyn-based company that teaches hula-hooping, Pilates and yoga.