Humangear Capcap 2-in-1 Accessory Cap Fits Nalgene & other popular wide-mouth drink bottles capCAP is 100% Polycarbonate-free and 100% BPA-free Drink spill-free through the small spout, and clean and fill with ease with the large cap Green, rubberized small cap is easy to grip, even with gloves on Wide, rounded strap is comfortable to hold.