If I can weigh in on the subject.
A JB Light Interior weighs .8KG or 1.75lbs - It should be about the same as a Justis as they both use the same polypropelyne shells as far as I know.
A JB Exterior of 4-6oz leather weighs 1.9Kg or 4.2lbs
A JB case with tubes and using 3oz leather weighs 2kg or 4.4lbs.
A JB Case with tubes and using 6oz leather weighs 3.2kg or 7lbs
The difference between a Justis Prolite and a JB Light case is that the Justis is made with the leather exterior directly on the plastic tubing with no insulation or other support at all. The JB case weighs a little more because the exterior is bonded with a fiberboard to provide a strong support shell for the leather. Then the exterior and interior are fitted together like a glove. In my opinion this provides a lot more protection for the cues and for the shell against acute impact. But the tradeoff for better protection is a little more weight.
A JB case made of lightweight industrial nylon with a light weight interior comes in at about 3lbs.
This case can have custom lettering done in a variety of ways, inlay, onlay, tooled section, embroidered, embossed, silk screened, and metal lettering attached with rivets.
A GTF 2x4 comes in at 4.4lbs using 4oz leather. It also can be personalized in many ways.
While we are at it - let me ask your opinon about something. I know a lot of players like the envelope style cases because they are lighter. What if I made tube style cases without the tubes? That means that the cases wouldn't have a plastic shell nor would it have individual PVC tubes.
But the leather would be bonded to the fiberboard and would hold shape well. You could squeeze the case and it wouldn't be very good with real hard impact, but it would be much better than just a sleeve as the envelope style cases are.
I'd layer in some extra foam rubber and the case would then be around 4.2lbs if made of 6oz tooling leather. Less if it were made of lighter leather.
Does that type of case sound interesting to anyone? It would be slighty cheaper as well since I wouldn't be doing the plastic shell or the tubes.
Call it the JB Lite-Lite
I will probably do some just to try them out anyway. I am thinking that they would be an in between sort of case between the envelope style and the tube style. From appearance they would be jsut like any tube style case and from weight and protectiveness they would be closer to the envelope.
Feedback welcomed on this subject.