How heavy are grow bags compared to clay pots?

A 20-litre clay pot weighs 5–8 kg empty (25–28 kg filled). An equivalent 20-litre grow bag weighs 0.5 kg empty (22–24 kg filled) — saving 5–8 kg per container. Across 30 containers, fabric grow bags save 150–240 kg total — significant for terrace structural load calculations in India.