There is no federal limit on the amount of alcohol someone may import into the U.S. for personal use, however, large quantities might raise the suspicion that the importation is for commercial purposes
Adults traveling into California from a foreign country by steamship or airplane may bring with them a reasonable amount of alcoholic beverages for personal or household use. A reasonable amount is not more than 60 liters (approximately five cases). (ABC agreement with U.S. Customs)
California ABC - Importing Alcoholic Beverages
Ну что, мне кажется вполне разумный объем для личного потребления 