Thank you for your feedback, and I am sorry to hear of your concerns. All our products are advertised and sold based on volume rather than weight as this provides a more consistent approach to the quantity of product in each bag, ensuring you receive the full 500 litres. We don't disclose the weight of the bags on our website as these can change from day to day i.e if the soil is damp, it will weigh more than soil that has been kept dry. I hope this information is helpful, but should you still have some concerns, please do not hesitate to contact us on 01430 631111.