Google rucking backpack, for a brand like Goruck. Their image of the backpack shows a hip strap. Some ppl online are saying this hip strap would distribute the weights evenly downward and will not cause too much strain on shoulder and back, which I though it's beneficial as I do feel shoulder and neck strain when weights are heavier.

I bought a Hyper Vest FIT from Amazon and liked it. If you search for one, try to get a front zip one and avoid the types that involves lots of maneuver (such as twisting upper body, bending etc.) to put on to protect spine, especially if your spine scores are low.