Face it, a lot of our time now is spent traveling to conferences, training and inspections. A 3DAP isn't needed for uniforms, suits or just clothing. A B4 bag works quite well.
Unfortunately, most B4 bags are "well-used" pieces of worn out vinyl or canvas.
The Military Luggage Company ( militaryluggage >> DOT >> com ) sells a new edition of the B4 travel bag that seems to meet that specific requirement.
600D Cordura nylon, locking zippers, four generous pockets for your choice of toiletries, boots or socks and a central compartment that can comfortably fit two suits or two military field uniforms.
Comes in green, coyote or the ubiquitous black, and I even saw one in tiger stripe. Velcro has replaced some of the snaps. ~$70 to $90 depending on source and shipping. I ordered mine through the big river place. This is a bag I would not mind getting thrown around.
It lays down well in the trunk, hangs from that little hook in the back seat or gets stuffed between other bags on long trips. I washed mine in the washing machine and air dried it. No damage. It seems robust. I'll find out on my summer road trips.