A compact umbrella has a hollow-cylindrical body forming a shell, wherein the shell is made of a solid material and is configured to accommodate the umbrella in a transport state of the umbrella, when the umbrella is closed and folded, as a protective umbrella shell and is further configured to operate in an operating position of the umbrella, when opened, as a handle shell or carrying handle. The at least one carbon nanotube structure is positioned on at least one surface of the base. A tether extends between the protection device and the vent member. The cage is particularly effective in containing explosions of large equipment tires 6 to 12 feet in diameter and having a stored kinetic energy in a range of approximately 900 kilojoules to 1500 kilojoules.