Refillable cartridges are containers used in devices like printers that can be filled with ink or toner multiple times. Instead of throwing away empty cartridges, users can refill them, which is often more cost-effective and environmentally friendly. This practice reduces waste and can save money over time. These cartridges are designed to be easily opened and filled with the appropriate ink or toner. Many brands offer refill kits that include the necessary tools and instructions. Using refillable cartridges can help users maintain their devices while minimizing their impact on the environment and reducing overall printing costs.