A bulging belly is nothing to be ashamed of at this popular sandwich shop. In fact, Potbelly is so popular that they're closing in on five hundred locations nationwide and beyond, serving up their menu specialties such as stuffed subs and "Mac and Soup." In addition to craving the food, repeat customers are also chasing after their next reward which always seems to be in reach as a member of Potbelly Perks. This loyalty program definitely keeps customers happy, making sure every visit is a rewarding experience. Please note that this loyalty program typically works for all your purchases at Potbelly Sandwich Shop, but some exceptions may apply.