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To illustrate potential new technologies in geosynthetics, a few innovative applications of geosynthetics have been selected and summarized. Extraordinary big geotextile bags encapsulating soil including dredged mud, geomembrane lining for a seawater reservoir for pumped-storage power generation, leak detection systems for geomembrane lining and built-in remedial measures, and need for a unified field test procedure are discussed in an attempt to locate a seed of a new technology. It takes a new idea based on the interdisciplinary knowledge and experience to create a new application and to lead it to a cost-effective, environment-friendly new geosynthetic technology.