Framless backpacks for hangers
I use a ULA conduit frameless pack and it works well for me. You will need to pay attention to the weight ratings since they generally carry less. The advantage of frameless is additional weight savings - my Conduit weighs 22oz. Hammocking made it a bit of a challenge to get everything to fit in my pack. I use a HH Hyperlite, Speer 8x10 tarp, and Nest/No Sniveler quilt combo. But I did manage to get this to work well for a recent 5 day trip. I stored my hammock and tarp in the outer front pocket, which is fairly large in the Conduit. Most hammockers bring along a pad anyhow as a contingency in case they are forced to "go to ground", so the pad you use as a pack frame support does in theory get dual usage. I also used my Gossamer Gear NightLight pad as a camp seat.