Visit Potbelly to take advantage of their promotion of “Buy One BIG or Original Sandwich, Get One Original Sandwich Free.” Exclusively available with the coupon code BOGO on Potbelly.com and the Potbelly App. Choose free curbside pickup to avoid paying delivery fees. Additionally, following your first order, join Potbelly Perks to receive a free Original sandwich. plus accrue points for free meals and other benefits.