A sub sandwich and shake are the perfect combo, anytime of the year.
Potbelly Sandwich Shop is shaking up the beginning of fall from Sept. 20 to 23.
Get a FREE shake with the purchase of an entrée at participating locations — just mention “Free Shake Offer” at check out. Limit one per person, per day — while supplies last.
Choose from vanilla, chocolate, coffee, OREO, banana, mixed berry or strawberry.