Keeping corn silage in the plastic bags as bagged silage is a new method which has some advantages as compared to placing silage in a silo. Some advantages of this methodinclude easy of storage and traort of the bags, more nutritional quality and less product losses. Manually placing cut whole corn plant in the bags is very labor-intensive and time-consuming process. Therefore,developing a machine that can be able toproduce the bagged silage automatically would be beneficial. To design such a machine, some of the product characteristics such as internal and external coefficients of friction, relaxation time, Poisson ratio, and compression force are needed to determine.For this purpose, two types of corn silage,the newly harvested and ensiled corn silage, were prepared and tested.Static coefficient of friction of the samples was determined on two types of contact surfaces (i.e. galvanized and steel sheets) using inclined plane method.The compression test was performed using a universal testing machine with constant loading rate. Considering the results of previous research for compressing silage in silos, thefinal bulk densities of the bagged silage were considered 600 and 800 kg m -3 . For each product, the test was performed in 200 mm min -1 loading rate and in 3 repetitions. The effects of product type, contact surface and level of compression on static coefficient of friction, applied pressure, modulus of elasticity and energy consumption were determined using completely randomized factorial design. In order to express the behavior of product during compression, a three-element model was fitted to the experiment data. The model was consisted of a spring linked to a Maxwell body (include of a spring and dashpotthat connected in series) in parallel. Stress relaxation times of the product were determined using Matlab software. The results showed that both type of product and contact surface have significant effect on the friction coefficient at probability level of 5%.The models fitted to the compression data had coefficients of determination (R 2 ) greater than 0.99. Although initial bulk density had significant effect on stress for a given strain, the type of product did not have any significant effect. The modulus of elasticity of newly corn silage was found to be higher than the ensiled silage. Energy consumption and specific energy required for compressing the product increased intensivelywith increase in strain.Type of product had significant effect on energy consumption but not on specific energy. In designing thecorn silage bagger, the following criteria were considered; low costs,simplicity and ease of operation by the user. Two prototypes were developed for the machine. The each prototype consists of three main parts;compressing