what frame pack are you using?
I have 3 now. Kifaru Duplex Lite w/Stryker XL (Gnargali on the way). Kuiu Pro 3600. MR Popup 28.
I haven't been out much due to being tagged out early during archery season and now snowbound. But the Kifaru DL/Stryker is what I've taken afield.
I can make a case for any of these, which is why I kept my original comment general.
Why the Duplex Lite then? It does the best job of the three at making loads seem light (for me). When I loosen the shoulder straps and load lifters, weight stays balanced and on my hips like it isn't there. The other two still lighten felt weight a ton, but just not quite as good for me.
Still, none of them are perfect, including the DL/Stryker XL or I wouldn't hang on to all three.
Some thoughts on the others:
Popup 28: What's nice about the Popup 28 is it collapses to the size of a normal daypack. It also fits a .5 like a glove. I was trying "use the stand as a frame" setups...(e.g. added lumbar pad to LWCG belt, BMG Duplex/Nuplex shoulder strap mod, etc.)...Those options work well indeed. But a frame pack has advantages here; most prominently it completely removes from the stand, so no belt and straps dangle below the platform when setup. I will caution that the Popup belts suck, imo, and I swapped to a Seek Outside belt which makes a huge difference. I have an EXO belt I'm going to try with it as well.
Kuiu 3600: The frame is very light and the Pro suspension is comfortable. In particular the belt conforms well and draws tight with no slippage. But it's really the 3600 bag that keeps this in my inventory. I like this setup for simplicity and capacity.