These are BRAND NEW ! in package with NO age issues at all, They look to be larger than the 50lb bags I have seen advertised, I am a certified Nitrox Diver and these are cool, They would also make a great Laundry bag for the enthusiast, THESE ARE VINTAGE, and do not have a dump valve, Open bottom to allow for expansion on ascent, Looks to be vinyl, well made. Blower under bag to show inflated size, comes in a protective pouch as seen on my motorcycle seat