Lego minifig compatible Custom SI-Dan Toys BC10 Sandbags can be fitted together with BH12 Sanbags to make a stud-less top to sandbag wall and defence bunkers. Because the sandbags have a slot on the bottom, you can mold several of them into a half circle shape. The BC10 sandbag can clip directly onto just about any BH12 Sanbags, Lego brick or plate.