Breaking the conventional bottom discharge structure, it adopts a dedicated side discharge spout on the bag for special equipment layouts and confined working spaces. The side spout position can be precisely customized to fit various non-standard production lines, side docking equipment, narrow stations and low-clearance areas. The reinforced and tightly tied spout prevents leakage during transport and ensures smooth discharging. The bag structure remains intact with stable load capacity, normal lifting and reliable stacking, perfectly solving industry problems of insufficient bottom clearance, equipment interference and misalignment.