Biofibers do not show the general relationship between crystallinity and strength observed in pure cellulose fibers such as cotton and rayon, that is, the higher the crystallinity, the higher the strength. The presence of substantial amounts of noncellulosics, mainly lignin, which contributes to the strength of fibers and the variations in the dimensions of unit cells, is the major reason for the absence of a good relationship between crystallinity and strength. However, biofibers with longer unit cells have higher strength, as seen from Table 2. Therefore, the amount of noncellulosics and dimensions of the unit cells in the fiber are to be considered when designing products using biofibers