Contigo Kids bpa Free Mug 4 Pack - Two 9 oz Blue/Green Mugs & Two 9 oz Green/ Orange mugs Patented AUTOSEAL lid is 100% leak-proof and 100% spill-proof. Lid is also one piece, meaning no loose parts. Drinking made easy! Press to sip. Release to seal. AUTOSEAL automatically seals between sips to ensure no spills. Contoured body makes this mug easy to hold for smaller hands. Will hold 10 oz. of your child's favorite beverage. BPA free. Made with polypropylene (PP) #5.