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This will prevent your punching bag from tearing. Don't worry if you cut the clothes up into pieces during the process. You won't be able to see them once they're in the bag. Don't pour sand or sawdust directly into your punching bag since it can damage the bag over time. Instead, pour it into plastic resealable bags, like 1 US quart (950mL) sandwich bags. After you add the sand or sawdust, seal the bags all the way so nothing pours out. The duct tape will make the bags more resistant to your punches. Wrap the duct tape all the way around the bags, including the sealed openings, so they're completely covered with tape. To weigh clothes or pieces of fabric, place them in large trash bags and weigh each trash bag on a scale. If you're adding sand or sawdust to your punching bag, weigh the individual bags on a scale. Then, add up all of the individual weights to get the total weight of your filling. If the total weight is less than your desired punching bag weight, you'll need to prepare more filling. Add more sand or sawdust to make your punching bag denser, or add more clothes or fabric to increase the weight without significantly increasing the density. Remember that your punching bag should weigh around 0.5 pounds (0.23kg) per 1 pound (0.45kg) you weigh, but the ideal weight ultimately depends on your skill level and fitness goals. For example, if you weigh 200 pounds (91kg), your punching bag should weigh around 100 pounds (45kg). If you're new to boxing, you could try 8090 pounds (3641kg) to start.

Summary:
Cut buttons, zippers, and other metal pieces off of the clothes you'll be using. Pour your sand or sawdust into resealable bags if you're using any. Wrap any sand or sawdust bags you're using with duct tape so they don't rip. Weigh the filling to make sure you have enough for your bag.