Cooler bags are efficient and portable, they are of different designs, inside part is flexible duty foil. Between the inner and the outer layers are materials aligned in fabric which helps in maintenance of food and beverage several hours due to their thin dense nature. They are essential especially when one is heading off to the park for a weekend picnic or want something to stop your lunch in a warm soggy mess before your lunch break at work or college. Its good for one to compare the sizes and shapes of the printed cooler bags depending on its use and check if its suitable and enough to pack your food. Most of them are flexible, easy and thin.