Under The Sea Ocean Childrens Birthday Party Supplies - Blue Whale Fish Plastic Sippy Cup with Straw (8) Includes 8 Blue Whale Fish Plastic Sipper Cups with Straw. Holds approximately 8 oz. Add additional party tableware, kits, decorations, favors, games, and activities to complete your celebration and entertain your guests. Great for childrens birthday parties, kids school parties, a pizza party, sleepovers, prizes, favors, or a theme party. Perfect for your Finding Dory, mermaid, or nautical birthday party!