This is a USGI 2 quart with carrying pouch. The canteen DOES NOT include a NBC cap. The carrying pouch includes a sling and two ALICE clips for mounting to backpacks or other compatible gear. You secure the canteen with a buckled flap. Also, the small pocket on the outside of the pouch holds small items, such as water purification tablets. The faux fur lining helps keep your water cool or from freezing in the cold. To cool off you water in hot weather, just soak the pouch in water and it will keep it cooler in the heat.