A conical-bottom liner bag in single-layer high-purity PE, suited to 19L vertical stainless steel drums. Its distinctive wide-top, narrow-bottom conical shape lets material gather naturally at the base during discharge, greatly reducing residual material in the bag. Raw materials pass strict particle and metal leaching testing and will not contaminate high-purity media such as photoresists and electronic reagents. Supplied with a sealing gasket, dust cover and clips, the sealed protection keeps out dust and air. The centred opening pairs precisely with dedicated supply tubes, and single-use replacement avoids drum cross-contamination and improves changeover efficiency on clean production lines.