 The study evaluated the influence of hybridizing jute and carbon fibers on the mechanical properties and water absorption behavior of polyester composites, revealing that jute-fiber composites have lower mechanical properties and higher water absorption rate compared to carbon-fiber composites. However, the combined effect enhanced the mechanical properties and reduced moisture absorption rate while having good interfacial bonding with polyester, as confirmed through scanning electron microscopy. The mechanism of fracture in mechanical tested samples was observed through scanning electron microscopic images, and all composites developed in the work followed Fickian behavior of water absorption. This article was authored by P. Ravi Kumar, G. Rajesh Kumar, Jaganathan Prakash Maran, and others.