Abstract: A forage compaction apparatus including a three point based chassis to contact the floor, that supports a hopper in its front end. The apparatus forming a tunnel in the rear end while housing a compacting rotor and retainer bars in the chamber between the front and rear ends. The forage is admitted into the hopper and packed into the tunnel by the effect of the rotor and associated retainer comb. These are designed specifically to create forces directed upwards and backwards in order to compact evenly the forage into an agricultural bag that closes the exit of the tunnel in the rearmost end of the apparatus. The apparatus has a power transmission system and controls forward movement by braking the machine while compacting so that as the machine packs forage, pressure is built in a special way into the tunnel and agricultural bag so that the bag is unfolded in the field as the machine moves forward.