Composite are now accepted in various structural application, but the emphasis has shifted towards environmental issues; which gives natural fibres the advantage as they are eco-friendly and biodegradable. This study involves the water absorption behaviour of flax and hemp combined natural fibres and the bending characteristics of flax/hemp hybrid polyester matrix composites treated at various temperatures. The stiffness of the composite was noted to reduce at 110 °C. The moisture absorption profile did rise to a variable plateau. Also investigated was the effect on the energy absorbed due to the presence of water in the composites.