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Weight of stuff for me is meaningless. I'm >90kg riding a massive steel 29er.
My OMM rack is cheaper but weighs maybe 1-150g more than the whole setup here.
But the "pack" will depend on what you put on it. So, if you were carrying fuck all, it could be argued that my setup is lighter. On the other end of the scale, I can carry more than the Aeropack, ~30kg with the axle mounts so there's that.
https://oldmanmountain.com/product/divide-bike-rack/
The Ortlieb Quick Rack, which I also now own (ffs) weighs half as much as the OMM but doesn't have the flat top plate so you'd need to find a hard-based top loader bag or add some rigid plastic before strapping on a dry bag.
https://bikepacking.com/gear/ortlieb-quick-rack-review/
Quick access items go up front anyway so the whole top loader thing seems a bit pointless to me.
So the game is: beat this price and weight with same functionality using non-proprietary parts…
(Never factor in the cost of your time)