Medical waste bags are color-coded, leak-proof polyethylene containers for safe segregation and disposal of biohazardous materials from healthcare settings, preventing infection spread per CPCB/WHO guidelines. Types: Red (pathological waste: blood, tissues, fluids, contaminated dressings), Yellow (clinical/infectious: soiled gloves, IV lines, syringes), Blue (glass sharps/sharp plastics), Black (general non-hazardous), White (highly infectious lab waste). Thick (1.5-3 mil), puncture-resistant with biohazard symbols; capacities 15-120L; autoclavable/compostable variants available.