Inflatable reservoir for containing a liquid, more especially an inflatable swimming pool, and a method for filling same

An inflatable reservoir for containing a liquid, more especially an inflatable swimming pool, formed from a single sheet of a flexible and fluid tight material defining a bottom supporting thereover the liquid filling the reservoir and a peripheral space formed by the remainder of the sheet folded back on itself inwardly over the whole of its periphery so as to form approximately a tube filled partially with liquid and partially with gas, discontinuous mechanical connection means being provided for connecting the free edge of the folded down remainder of the sheet to the bottom.