The large-capacity square profile has an optimised load-bearing structure, suited to batch production storage and medium-distance transfer, with a regular shape that stacks easily in multiple layers. Formed in one piece from dual-layer HDPE with excellent barrier performance, it pairs with a PTFE sealing gasket to resist leakage in long-term storage and transport. The thick body withstands impact, and each unit is dust-free washed to a high standard before dispatch, maximising impurity leaching suppression. Suited to semiconductor high-purity reagents and fine chemical liquids, meeting plant-scale blending and centralised feeding needs.