VEVOR Scuba Tank, 0.5L Portable Scuba Diving Tank, Diving Oxygen Cylinder Supports 5-10 Minutes Underwater Breathing, 32.81 ft Diving Depth, Lung Tank Kit with Snorkel Mask for Underwater Exploration

It does not contain gas, so the gas cylinder and the first-stage valve need to be separated. You need to consult the airline in advance, as different airlines have different requirements.