 These journeys also paved the way for the "lightweight"-style small expeditions that followed.A prime example is the successful 1978 ascent by Reinhold Messner and Peter Habeler, the first without bottled oxygen, and followed by a 1980 solo ascent (also without bottled oxygen) by Messner.The 80s and 90s saw the emergence and rise in the commercialization of the ascent to Everest's summit.