The sleeves on the original Nomad (unzippered) are where I put my spotter/tripod most of the time. The small bungee corded pockets will also work, and I use them to hold my 15x binos when leaving the spotter behind. I’ve also kept the spotter/tripod attached and closed the wings around it so the...
A more apples to apples fabric weight comparison is the Sitka Traverse vs. the Kuiu Peleton 200 and in my opinion the Peleton can't hang due to the total lack of features and baggy fit.
I'm very pleased with my Apache for late fall trips. It's too much and cooks me if the nighttime temps stay above 30 though. definitely good to the rated temp.
Jim at Jimmy Tarps made me a nice bag for sand bags or meat out of 500d Cordura. It hangs from the top of the pack (Kifaru) by 3bar sliders and is narrower at the bottom than at the top so sand cannot settle to the bottom of the pack. Mine holds about 40 lbs but he'll make it to your specs.