The UniFill automatically lowers the crop piler into the big tote and as the tote fills, the piler rises. When full, the reversible conveyor automatically reverses to feed the other vertical piler and the process is repeated. When carrying out bin filling, the conveyor traverses over the bin allowing the vertical pilers to fill bins evenly and gently. A fixed-top model is available for filling big totes only, in which the crop conveyor is fixed for big tote filling, without the need to traverse.