The harness is the part of your harness/container system that is designed to keep your body attached to your canopies. In today's sport skydiving gear, the harness and container are 2 different but inseparable pieces. It wasn't always like that. In the 60s and early 70s harnesses and containers were interchangeable. That allowed to quickly swap components as needed. While this might seem like a good idea at first, these systems had their own set of problems. They were heavy due to the additional hardware needed, and error prone, as they had more room for assembling errors. In the 70s manufacturers started to integrate both into a single harness/container system, hiding part of the harness in the backpad of the container. This concept stays with us almost 50 years later.