Pretty much any hold all will work; just depends on how much stuff you're trying to carry. Timbuk2 Commute works well if you're just trying to carry EFB and a headset; has the benefit of looking like a regular messenger bag and is useable for other stuff than flying. For something slightly larger, Luggageworks makes a couple EFB bags with various pockets. I've seen the Luggageworks Pro Crew that my gf uses and it's a good bag. A step larger, while still fitting the kitbag holder, is the Aerocoast Pro Crew. I've recently started carrying that and am really happy; if anything it might be excessively spacious. Finally, I've used the Aerocoast EFB cooler and that's a good option to hold cold food, your EFB (back pocket), and vest/headset in a top pocket (fits a DC Pro-x no problem).