I've owned and packed with (2) break down frames. The one by Cross Creek and the Rocky Mtn Rhino. In theory, the take down frame concept sounds good but there are some major compromises.
The first compromise is packing the takedown frame (in it's stuff bag) into your daypack or fanny pack. They are not that small and do take up most of the room in a fanny pack or a substantial amount in a daypack. And I've owned about 6-7 fanny packs including the double decker types. You are left with little room for other gear (spotter, jacket, etc).
The second compromise is how these takedown frames handle heavy loads. Yes, they do handle heavy loads but they come with a price, namely comfort. You may be using the take down frame for only the first meat trip out but if it's a long and heavy one you will be cussing all the way, if you make it without injury.
So then one decides to hunt with the frame assembled with your fanny or daypack strapped on. Later it's decided these frames are not as comfortable or as quiet as a regular frame so you switch to the ext. frame. But most ext frames weight at least 4.5lbs before the fanny/daypack are strapped on.
Why not just hunt with a specialized pack like the 4lb Badlands 2200 (2310ci) that can handle a moderate load for the first pack out and then return with a heavy duty ext frame like the Barney's, BullPac or GG Stratus Flatbed?
Btw, I sold both of my take-down frames long ago, ran a BullPac setup for about 7yrs and now I'm going to give the Badlands 2200 a try for my day or weekend hunts. Seems like the Badlands 2200 has went thru some refinements and there are many satisfied owners out there.
As for hot weather hunting, in MT?
MtnHtr