To use these heavy - duty black rubble sacks, simply open the top of the sack and start filling it with your debris like building waste, soil, or unwanted items from your house clearance. Make sure not to overfill them beyond the 20 Kg capacity as it might cause the sack to tear. When carrying the filled sacks, hold them from the bottom for better support. Store these sacks in a dry place when not in use to prevent any damage from moisture. If they get dirty, you can wipe them down with a damp cloth. And always check for any signs of wear and tear before using them again.