This item is so rare you will not find one anywhere else. Only 500 of these were made to be used at the Marine Mountain Survival School. This was a prototype run that were only issued at the school. I have not used it since I have owned it. It was developed with a wide mouth so they could cram snow inside it easily for melting. This is the Holy Grail for canteen collecting. This 32 oz canteen will fit in all GI Cups.