A dual-layer composite PE clean liner bag designed for 60L steel drums, with strict control of fine particles and metal leaching so high-purity media such as photoresists and electronic solvents are not contaminated. The one-piece bag body comes with a standard dip tube, sealing gasket, dust cover and clips, achieving fully sealed, oxygen-isolated and light-blocking containment after filling. The integrated centred opening suits automated production line feeding; it fits the drum wall during pouring and extraction leaving no residue, and can be replaced directly without cleaning the drum — fully avoiding cross-contamination between reagent batches in cleanroom recycling storage and transfer dispensing.