In order to improve its mechanical performance without compromising its reputation as an environmentally friendly material, PLA has therefore been combined with a range of natural fiber reinforcements, including jute fiber, microcrystalline cellulose, wood flour, wood fiber2–5 and, more recently, microfibrillated cellulose (MFC).6–9 MFC is of particular interest in that it is not only renewable, biodegradable and recyclable, but also potentially capable of very high degrees of reinforcement at low-volume fractions owing to the relatively high aspect ratios of individual MFC fibers.10,11