To get started, the many times I have started over, it was always handier to start with something to carry it all in. It is the container that makes it a kit.
Good point Art. I started with Doug's PSP. Looked at trying to put it into an Altoid tin. Realized I also had a few snares I wanted to add and looked at the OtterBox. Found out the the OtterBox would hold two Altoid tins perfectly along with a mini tin. The kit evolved from that.