I just purchased the Eberlestock F1 mainframe after eyeing it for two years and I must say I love the thing so far. I also picked up the bat wing pouches, small accessory pouch, side scabbard, and butt bucket for carrying my bow. Awesome setup for going in deep. I think it could possibly even be taken up the tree as it is much smaller than most frames being only 11x23”,I believe, and a low profile when bat wings are compressed with sinch straps.
Before this I used a alps outdoors frame that I customized to size and to work with a removable sling pack for taking up the tree. FYI sling packs work out super nice for carrying the predator, once at hunting height they can be spun around front for easy access to platform. However the alps Isjust not built tough enough for me it’s wearing out after putting less then 50 miles on it. Eberlestock is far superior in quality, tho I haven’t tested yet, it is obvious. The modularity of this system is what ultimately sold me .well done Eberlestock. The f1 mainframe is on sale right now on their home site.