The Cool Bag from PENN are made of a 500D polyester material with PVC coating and the inside is made of a strong and high-quality insulation material. They are also finished with a strong SW proof zipper with zipper pullers. The smaller size is perfect for storing bait for coastal sessions or taking some drinks with you, while the large size is perfect for longer sessions, with a large amount of bait and even room for food and drinks. It also fits into trays of bait and is ideal for taking the fish home in top condition from the end of a session.