Start with an ultra lightweight  extruded rigid plastic core - capable of withstanding 2000 pounds of pressure - with a 6" in diameter and 48" in height

Add a black exterior covering made of 1000 denier Cordura®

Add a padded three-point strap for single or dual shoulder use

Add a locking hardtop cover - stainless steel locking pin and combination master lock®

Optionally add an easily removable stand or easily removable wheels (one bolt) shown below

And you have the basic Cargo dual purpose travel and golf bag.

Next, decide if you want pockets permanently attached to the Cargo bag - this is the Voyager Model - or have the pockets detachable - this is the Convertible Model. 

The Convertible, shown above,  has two removable pockets, large enough to carry shoes, a rain-suit and balls, which can be easily removed when traveling.

The Convertible weighs 6 pounds and hold 14 to 15 clubs.  The diameter is 6" - with a small divider bar in the middle.  The inside of the case is lined with fabric.  The outside is covered with Cordura.  Two year warranty.

According to the manufacturer, overall height, width and length is less than 62" so you won't be charged for oversize baggage by the airlines.