The Nalgene Wide Mouth Silo HDPE Bottle is constructed out of High-Density Polyethylene with a standard loop-top cap. The plastic is tough, non-collapsible and allows you to see the liquid level for quick identification. The loop-top cap ensures the cap stays attached to your bottle in extreme conditions, you will never lose your cap again, plus there are no leakages. The Nalgene bottle is BPA free and holds nearly 1.5 liters of the beverage of your choice and is ideal for any time, anywhere use mainly for hiking, biking, camping or any active outdoor sports. The Nalgene Wide Mouth Silo HDPE Bottle is a must have when carrying around your hydration. Nalgene Wide Mouth Silo HDPE Bottle Features Size: 1.5 Litre/48oz Standard 63-mm Loop-Top cap High-Density Polyethylene (HDPE) construction is tough, non-collapsible and allows you to see the contents for quick identification Wide mouth for easy addition of drink mixes Loop-top cap stays attached in extreme conditions-never lose your cap again. Polyethylene is 100% BPA free "