Back in the late '60s, I designed a kit such as dreamed by JI. It was based on the hard sided, large, but lightweight American Tourester briefcase then in vogue. It was used, for many years by our local volunteer ambulance corps. I first decided what supplies were to be carried. Then I took the case and the first aid supplies to the shop teacher at the Middle School. We worked out the interior arrangement, which he framed out in lightweight wood and he added a clear plastic latching lid for both sides. It was very efficent and easy to work from,especially at car accident scenes.