Coir fiber reinforced polypropylene (CFRP) and Coir-Glass reinforced polypropylene (CGRP) was fabricated using a proprietary hot press designed for the purpose. By incorporating up to 20% (by weight) glass fiber, the tensile modulus is increased by 12.5%, and the tensile strength is increased by 7% compared to those of CFRP. Sorption behaviour and effects of environmental aging on tensile properties on both CFRP and CGRP systems were studied by immersing samples in water for up to 1200 hrs at 27 ^oC. Compared to CFRP, a 4% drop in saturated moisture level is seen in CGRP. After aging in water for 1200 hrs, reduction in tensile strength and modulus for CFRP is nearly two times less then that of CGRP. It is shown that the durability of coir fiber reinforced polypropylene can enhance by introducing a small amount of glass fibers.