The 32-ounce can offers plenty of advantages over the howler: The aluminum is more effective at blocking light (public enemy No. 1 for beer) and, provided it is filled correctly, oxygenation; they don't need to be cleaned out like growlers and howlers; and for the consumer, the beer will keep far longer and is easier to transport. (For instance, getting beer home from distant locations will be much less perilous.)