Background: Failed attempts to improve the delivery of healthcare to communities show distinct flaws that have a higher impact during a major incident or disaster (MID). This study evaluates the concept of surge capacity, which intends to achieve a balance between the needs and resources in affected areas by providing staff, stuff, structure, and system. Methods: A systematic literature review was performed according to the PRISMA statement and by using PubMed, Scopus, and Google Scholar, and related keywords. Results: There were limited publications about flexible surge capacity (FSC). However, the sum of data obtained indicated the need for flexibility in expanding major incidents or disasters, demanding new resources, which may neither be available on time nor reachable due to infrastructural damage. Conclusion: FSC is a novel concept based on international guidelines. It refers to the extra and adjustable human and material resources that can be mobilized by activating nonprofessional but educated staff and different but accepted facilities in a fast, smooth, and productive way. Public health and public education play an essential role in obtaining such flexibility.