Nalgene Tritan Wide Mouth BPA-Free Water Bottle, 16 Ounce, Green Large opening on wide-mouth bottle easily accommodates ice cubes, fits more water purifiers and filters, and makes hand-washing a breeze Attached Loop-top never gets lost and screws on and off easily. Printed graduations let you keep track of your hydration. Made from Eastman Tritan copolyester that is manufactured without BPA. Resistant to staining and retaining odor. Fits in a standard water bottle cage; dishwasher safe and easy to clean