def generate_packing_list(duration, preferences, transportation):
    basic_items = ["Water (1.5 gallons per person per day)", "Food", "Shelter (tent or RV)", "Warm clothing", "Cool clothing", "Dust mask or bandana", "Goggles", "Sunscreen", "Hat", "Comfortable shoes", "First aid kit"]
    
    if duration > 3:
        basic_items.extend(["Extra socks", "Biodegradable wet wipes", "Portable battery pack"])
    
    if "art" in preferences:
        basic_items.extend(["Art supplies", "LED lights for nighttime visibility"])
    
    if "music" in preferences:
        basic_items.extend(["Earplugs", "Musical instruments (if applicable)"])
    
    if transportation == "car":
        basic_items.extend(["Extra gasoline", "Car repair kit"])
    elif transportation == "rv":
        basic_items.extend(["RV sewage and water servicing equipment", "Generator"])
    
    return basic_items