Under the threat of nuclear war, Americans were encouraged to build fall out shelters and stockpile supplies to survive underground. This can reads: 'Property of US Govt.; Contents 10-10 1/2 oz; Emergency Drinking Water; Contract No NY 73669-62; Spec No MIL-15117B; H&M Packing Corporation; Glendale California.' It measures approximately 4.875 inches high and has a diameter of 2.688 inches.