We've been getting smaller foam ice chests in the mail - good size for lunches for two or small picnics - not deep enough for a gallon of milk. Will include some freezer packs if you ask.
Interior space is close to 17.5" x 7.5" x just over 6" deep. Very thick walls (similar foam chests used to ship meds or frozen foods) - so they should hold the cold well, even in summer heat.
