Funny Beer Coolie Best Buckin' Grandpa Father's Day Gift for Grandpa 2 Pack Can Coolies Drink Coolers Black The best Father's Day gift for Grandpa. This gag gift for Grandpa is sure to bring a smile. Holds 12 oz cans or 12-16 oz bottles. Folds flat for easy storage. Machine washable. Premium 1/8" thick high density open cell polyurethane foam keeps beverages cool. Coolies make a great gift or party favor. They are a momento with purpose!