Ok, I'm getting close to pulling the trigger on a new rucksack and would love some specific input from those in-the-know. Here is my concern, and the reason I keep leaning toward a setup from GoRuck:
GoRuck has plates and a specific compartment for those plates that keep the weight up high in the bag and directly on the back. I know from what's been said here Mystery Ranch makes great bags, and that I can make my own sandbags (etc) and use a MR as a ruck sack: but I'm concerned with there being a lot of dead weight at the bottom of the pack that will be pulling on my shoulders the whole time. It seems like the DESIGN of the GoRuck pack would eliminate this but keep the weight up higher and nearer my back, rather than sitting heavy at the bottom of the bag.
Does this make sense? And is this a legit concern?
If your goal is only weight training and using the bag specifically for that, I think you’d be fine with a GoRuck/plate setup
If your goal is to add weight/resistance to your lunch break walks, I’d actually second the recommendation for a weighted vest. It’s going to shift the center of gravity to within your body vs. hanging off the back, which can cause its own blend of problems if the pack isn’t 100% dialed in and fitted to you, regardless of what brand you choose.
But, don’t overlook the humble pillow. It can be stuffed into any brand of pack to put weight exactly where you want it. That said, smaller/flatter weight is going to move the CoG closer to you, which is what you’re after. A plate setup will be far better suited for this task than a sandbag.