Proper usage of sharps containers includes: 1. Placement: Place the container at eye level and within arm's reach to ensure easy access and reduce the risk of accidents. 2. Filling: Do not overfill the container. Most containers have a fill line; ensure it's not exceeded. 3. Disposal: Once the container is three-quarters full or reaches the fill line, it should be sealed and disposed of according to local regulations. 4. Handling: Always handle the container with care, using gloves and following lab safety protocols.