Little bottles of shampoo etc.
Single use plastic toothbrushes.
Supplied bottles of water where tap quality is poor. (Accor’s efforts to use larger glass bottles in each room and ‘gallon’ water bottles in the hallways to refill from, is to be applauded)
Towels getting changed each day (often irrespective of those ‘save the planet by hanging up your towel’ signs).
Food wastage at buffets (food taken but left on people’s plates, not generally a direct hotel problem)
Modern capitalist society loves consumption.