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Biomass transportation is hampered by the inherent low bulk density of herbaceous materials, causing containing equipment to reach their volume limit far before their weight limit. To evaluate the purported efficiency increase, it is imperative to determine the energy requirement of the compression process. In addition, to design containers for compressed biomass transportation, mechanical parameters of the biomass, such as Poissons ratio, must be determined. This paper describes the measurement of these quantities for Miscanthus giganteus and switchgrass under uni-axial compression, using four particle sizes ranging from unground (about10-30 cm) to 25.4mm, 12.7mm, and 6.35mm, at three repetitions each.