A fish cooler is obviously going to be more bulky and heavy than any fish bag you can find to bring along and keep your catch inside. You need to determine whether you really need to have the extra reassurance of the hardened cooler and its ability to keep your cooler’s contents well-protected. It’s also important to know whether you have enough room for a big, heavy cooler on your boat.  Fish bags make it possible for kayak anglers to keep their catch without having to lug a big cooler on board their boat. If you want to save space and still have the means to keep your fish cold and fresh, a good quality fish bag is essential.