I lean towards a brief case, but for your end of the industry that would not be practical.
There are a lot of bags, buckets and boxes out there look for something that will be organized and allow you to see whats missing in a glance, for me I think something like the bucket buddy would be nice supplemented by a metal tool box.
There are a lot of bags, buckets and boxes out there look for something that will be organized and allow you to see whats missing in a glance, for me I think something like the bucket buddy would be nice supplemented by a metal tool box.