If you need more space than this bag offers then you need a truck to haul your gear, not a bag!
This bag is my third and, if it holds up, my last. I can easily fit three markers, three tanks, twenty pods, two 4+3+2 harnesses, two E-Vents masks with four lenses, two sets of gloves, two neck protectors, huge amount of tools, cleaning supplies, large stock of batteries, two jerseys, spare pants, and still have room to spare.
It's practically unliftable at this point so the wheels and pull handle are a must. With as much weight as you can fit in this bag I don't care how good the stitching is, the handles would eventually pull loose if you couldn't roll it.
The layout of the bag is great, the marker bags will hold three markers, the MTS will work to strap a set-up marker to at the field rather than just laying it down. The digicamo looks great!
All in all a fantastic bag. I'm not sure what I would do to improve it.
Again, this is a great, well thought out and organized bag which appears to be very durable. I'd highly recommend it. Just don't pick it up after you've filled it up or you'll be getting a hernia repair.