SIFCON is a type of high-performance concrete distinguished by its exceptional strength-to-density ratio. This study achieved significant density reductions by incorporating single and hybrid fibers to develop modified-weight SIFCON. However, the production and use of SIFCON involve substantial amounts of cement and fine aggregates, which have environmental repercussions. Substituting cement and fine aggregates with glass waste contributes to enhancing environmental sustainability by lowering cement consumption, thereby reducing CO₂ emissions associated with its production. Eco-friendly SIFCON was evaluated through three tests: compressive strength, ultrasonic pulse velocity, and density. These tests were conducted on six different mixes, all containing a 4% fiber volume fraction in single and hybrid configurations, along with a reference mix. Among the formulations, the hybrid combination of 1% basalt fibers, 2% micro steel fibers, and 1% polypropylene fibers demonstrated the best performance in compressive strength and ultrasonic pulse velocity. On the other hand, the use of polypropylene fibers alone resulted in the decrease in density ,the decreases of 0.73% after 7 days, 1.1% after 28 days, and 0.76% after 90 days. Meanwhile, the hybrid composition of 1% basalt fibers, 1% micro steel fibers, and 2% polypropylene fibers showed the lowest density growth in hybrid mixes, with increases of 2.5% at 7 days, 2% at 28 days, and 2.4% at 90 days.