This is exactly what I wanted a bag for, and for the same reasons.
I was carrying my Drill Driver and Multitool in a small box, and my hand tools in a medium with two trays.
I figured all of this standard work kit could be carried in a bag. Leaving me to carry boxes of any extra tools needed, in each hand and out of the car, jobsite etc with a bag on my back.
I ordered the New Compact Tool Bag, but sold it after realising it wasn't a backpack. It's also quite a short bag. If it was a backpack and was taller it would have been the perfect addition to my toughsystem 2.0 set.
I use milwaukee tools but actually prefer the toughsystem as the boxes are lighter and roomier. Easier to attach and detach imo. But very limited range.