The North Vietnamese Army received considerable amounts of military aid from the Communist Chinese. One of the items they received in large numbers were these army canteens that are derived from the PLA Type 50 or Type 51 Canteen.
An aluminum canteen will hold approximately one liter. Cotton webbing holds the canteen securely, and the shoulder strap is adjustable. So far there haven't been any leaks when the cap is secure, the canteens came clean and required minimal washing. Minor dings and slightly worn webbing do not affect serviceability. I am fully satisfied with this product.