Leak-proof sports sipper with soft, flexible, child-proof straw. * easy handling by child and parent alike. straw valve lets Flip-It Sports Sipper avoid messy spills and keeps straw clean when not in use.Parents never need to worry about any messes with a Nûby No-Spill Straw: No Spills! No Leaks! No Mess.1 per pack. Assorted Colors.