The true test of a New York transplant is how she carries her lunch: The newer girls haul their leftover pasta in small shopping bags from Barneys or Tiffany that they carefully save for subway rides. Once you've been here a few years, you give up and start hauling yesterday's Dim Sum in a plastic sack from Duane Reade. Eventually, of course, you surrender altogether and walk to Whole Foods during your break (where the Pomme Frite station is particularly amazing). Still, that hasn't stopped big stores in New York (and elsewhere) from changing up their shopping bag design, attempting to create "walking billboards" out of their shoppers - at least according to the New York Times. They claim stores have recently started revamping their shopping bags for brighter, smarter sacks that attract more customers and also broadcast the store's allure - but I think the true test of a store's shopping bags is how often they get reused. Cathy Horyn recently recounted an experience of seeing a guy on the street hauling a Jimmy Choo bag which "had cost him enough to feel proud and, I suppose, pleased with himself." My two Jimmy Choo shoppers got sent out with the recycling, but I do have one Louis Vuitton bag under my bed that I don't really want to chuck, though it's too small to carry anything except a few cannoli (my winter addiction). Do you keep your shopping bags? Which ones? Why?