Using this Polivac Koala cloth bag for your backpack vacuum cleaner is easy. Just attach it to your vacuum cleaner according to the model's instructions. When using, make sure the bag is properly installed to avoid any dust leakage. As for maintenance, it's a good idea to check the bag regularly for any signs of wear and tear. If it gets dirty, you can clean it gently. However, if it's severely damaged, it's time to replace it with a new one. Always follow the safety guidelines of your vacuum cleaner while using this bag.