Unc you have brought up a very good point. My only gripe with Double Bulls are the sorry " bag" they have for carrying. If the shoulder strap in that thin cloth is all you hauled it around by, it would tear in very short order. We use the old safety belts that came with Loc-On treestands (simple web loop with a tightening buckle on one end). Loop the belt over each end of the blind (in bag of course) and it then makes it VERY much easier and sturdier to carry. But my initial point to your comment. For the guy that likes to carry the kitchen sink with him (that includes me in most hunts) I have thought about getting one of those game carts you see in catalogs that are used around my part of the country by public land hunters. They would be very easy to strap a blind onto as well as your bow/gun, backpack and anything else. Then all you have to do is drag the lightweight cart along behind you (remember both hands are now free) instead of carrying all that weight on your back and legs. They could easily be hidden in the blind with you are just left in nearby brush while hunting.
I easily get hot while walking when I have my " gunseason" clothes on (Browning quad parka, Columbia bibs). I used to put the bibs on and carry the coat or strap it to my backpack but I still would get hot by the time I walked in and climbed up in my stands, and the coat was still cumbersome. Lastyear I bought a plastic mesh decoybag from Avery Outdoors, it isnt the standard sized/shaped decoy bag but instead is appx 3 1/2ft long by maybe 16" wide. Kind of " tube" shaped. I can put EVERYTHING in it including not only my heavy outer clothes but my backpack, seatpad and even my rifle if I want to. I learned to load it " heaviest items in bottom" and it gets lighter as the pile grows higher. That makes it carry much easier and puts the weight under your beltline instead of up on your shoulders or behing your neck. It has made a WORLD of difference and I arrive in complete comfort and not wet from perspiration. (BTW a Double Bull would easily fit in it as well.) I tie the bag on my haul line and once in stand I haul it up and place it on a hanger and then start " suitin up" . Once finished I just drop the bag to the bottom of the tree and it collapses out of sight. I' ve had deer walk within feet of it and havent noticed it.
I would also think the handcart trick would work great for turkey hunters, after lastyear I simply REFUSE to turkeyhunt without my Double Bull but would like to have the blind " on wheels" between spots and while covering ground in search of them. And yep, dead turkeys/deer are MUCH easier on your back when they are on wheels!!!
They say necessity is the mother of invention!

RA