Suction liners are disposable, leak-proof plastic bags (1000-3000cc capacities) used in surgical suction systems to collect fluids, blood, and debris during procedures, fitting reusable canisters (1-3L) connected to wall/vacuum units. Features include shut-off valves (overflow protection), bacteria filters (prevent backflow contamination), solidifier options (gel blood for safe disposal), and color-coded lids (white standard, blue filtered); series connection handles high-volume cases like orthopedics/ENT. Extra-strong polyethylene withstands 400-600mmHg vacuum; incinerator-safe post-procedure. They reduce infection risk, cleanup time, and staff exposure vs. reusable glass.