21st Birthday Gifts For All Celebrating 21 Years 12 Pack Can Coolie Drink Coolers Coolies Diamonds The best 21st birthday gift is a funny birthday gift. This funny beer coolie is a perfect birthday gift. Premium full color sublimation printing creates vibrant and long lasting colors. 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. The pictured design will be featured on both sides of the coolie so that you can see it from every angle.