capCAP is the ingenious 2 in 1 accessory cap for Nalgene, CamelBak other popular wide mouth drink bottles by Human Gear. Drink spill free through the small spout clean and fill with ease with the large cap. . capCAP is 100% polycarbonate free and 100% BPA free. Both caps are made with FDA approved food safe polypropylene 5 plastic. The green, rubberized small cap is easy to grip, even with gloves on. Smaller cap opening makes it easy to drink without spills. Larger cap makes cleaning and filling easy. The wide, rounded strap is comfortable to hold. Humans have noses: capCAP makes room for them. Humans have soft fingers: wider, rounded strap is comfy.