The D4 Quad is Brightline's largest configured Drone Bag. It combines a CS4, a Pocket Cap Front, and the Pack Cap Rear. The Pack Cap rear allows the bag to be configured as a backpack for those times when you need to fly and be on the move at the same time.
The D4 Quad consists of a CS4, inside which you will place either the Drone Foam for the (original) Mavic Pro, or the Drone Foam for the Mavic 2 Zoom/Pro, or the Drone Foam for the Mavic Air 2. Also, of course, you get the Pocket Cap Front to organize all the additional small stuff that goes with being a UAV Pilot. And finally the Pack Cap Rear is included, which allows you to choose whether you want the bag to be a backpack or not.
You'll get two Side Pocket Charlies, one for each side. These work great for holding spare props or even more batteries, etc.
The D4 Quad also includes a Main Handle and a Shoulder Strap. (Most of the time, it's nice to keep the backpack straps stowed away and just use the Handle and the Shoulder Strap.)
Keep in mind that this bag, as it is presented here, is just a suggestion. It's a logical and useful starting point. You'll probably love it just the way we've configured it here for you. But you can change it and customize it to your heart's content. Just "Add To Cart", and then you'll see that there is a "Split Into Parts" button. The bag will be separated into all of it's component parts which you can then change as you see fit by adding and removing items within "The Builder". You can substitute a plain Flat Cap Rear instead of the Pack Cap Rear. Or you can choose different Side Pockets in place of the two "Charlies" that come by default. Or you can add a whole new Center Section for more space (or more drones). Truly a case of "Pick your Parts. Build your Bag."
Note that when you receive the CS4, it will by default include a "divider shelf". This part won't necessarily be useful with the drone foam installed and you can set this part aside. The "divider shelf" is used in the Flight Bag world for separating two headsets inside the CS4.