Real-world technologies to provide better safety to spaceship passengers

Is there any real technology, experimental or conceptual, that can prolong a person's survivability in outer space in case of sudden life support failure? Something that is also easy to wear or implement for day-to-day activity? Something that you keep on your person in the spaceship/station on all time that, in case of a hull breach or similar disasters, can help you survive long enough until help arrives?

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Real-world technologies to provide better safety to spaceship passengers

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