I don't use a saddle, but use something pretty close which is the Lone Wolf Assassin platform. It came with a seat belt webbing harness which I ditched and now use a modified rock climbing harness which weighs almost nothing. I can fit the platform in my pack along with 1-2 mini climbing sticks. It's nice because the whole setup (platform, sticks, harness, tether) weighs around 10 pounds and I can climb as high as I want to.
I've shot several deer from it in the compound, but nothing yet with the longbow. It's not an all day sit stand, more like 2-3 hours max. Once mid-October rolls around I switch to the regular stand. Sometimes late season I'll use it again, sometimes not. But it's great for September hunts when I'm walking in through several hundred yards of swamp and marsh when it's hot.