That's nice, I've battletested a lot of backpacks and the Helipro is okay but the back panel is not designed for a human. It's not designed for anyone actually unless you count a bit of padding on the lowerback as design. hauling stuff around in it for more than 8hours hurts because the backpack doesn't contour your spine or fit like a bag should. It also lacks watertight zippers where they're most critical, and the buckles have broken a few times.(thankfully Dakine has a good warranty)
With the Silo, i've done everything from carrying a laptop and my lunch to work to hiking the BC and jumping out of helicopters. It's solid as a rock and I've never gotten sore on those long days. Never gotten water inside it, and i've never had any hardware break.