The paper is focused on the design of a container tool for forming of sheet metal parts used in the aerospace industry, which is based on a flexible medium. The tool is intended for hydraulic press CBJ 500-6 and it is multi-purpose for a wide range of materials, shapes and sizes. A combination of polyurethane plates Fibroflex and two rubber plates are used as an elastic medium. A punch is made of plywood of 28 mmthick with negative shape of a part. For elimination of a springbackduring a bending operation,relieving of bending surfaces is performed. The designed tool and its dimensions are verified by using FEM analysis and subsequently also by practical experiment, i.e. verification and debugging functionality for a standard product of aluminium alloy 6061.T6.