c. Work out your collection requirements Total the volumes of each type of waste per day Some items can be combined such as glass, metal, plastic, paper & milk cartons - referred to as 'co-mingled' waste. (but, no food scraps, polystyrene or plastic bags) Calculate the required bin size and frequency of collection - e.g. if your property produced 242.5 litres of 'co-mingled waste' per week then 1 x 250 litre bin should be sufficient with a once a week collection frequency