The use of the bags is very easy. Pull the closure strap to pull the bin liner out of the bin and seal it. And the coloured label on the inside of the lid of your waste bin tells you which size bag you need. Quick and convenient to insert and remove. Use the clear colour code to find the right bin liner. Perfect fit in your bin. No unsightly overhanging edges. Special ventilation openings make it easy to insert the bin liner. Made of especially durable quality plastic (HDPE). Practical transport and closure strap.