I put my backpack over my treestand. The foot platform is right against my back and I pull the backpack straps through the grid of the foot platform. I have my backpack attached securely on top of my treestand and I use the padded straps from the backpack in lieu of the straps that come with the stand. It's very comfortable and secure for me.

I also use a bow/rifle backpack so my bow is actually tied into my backpack. Attaching my backpack (with my bow secured to the bag), to the treestand I have all my gear comfortably strapped on my back. I find it nice to have my hands free on a long hike to my hunting spot.

Everyone has their own formula, this is what works best for me.