Warning:  Don't buy if you live in a hot, humid climate.  I live in south Florida and within days, these boxes of sugar were rock-hard blocks.  I keep them in the refrigerator now, but they're basically impossible to use.  I'm thinking I will just make a gargantuan batch of sweet tea or lemonade with them, so I can melt the whole block down at once -- if not, it could come in handy as a weapon should I ever need to hit someone with a brick.