Other than being pretty heavy for a daypack, my DT1 worked pretty well. I feel like if I got a T2 or T3 bag instead to save weight, eventually I would get in a situation where I couldn't fit all of my gear. I like all of the room and the fact that I don't have to pack smart.
I put my calls and wind checker in a small belt pouch on my right hand side. In my opinion the small is the correct size to wear on the belt, because it doesn't hang down below the belt or sway when I walk.
My bugle, shooting sticks and extra water bottles went in the tall pockets on the sides.
My smaller items like extra calls, camera, GPS, Havalon knife, compass, etc. went in the small pockets on the back. The only thing I don't like about the location of these pockets was when I bungee my jacket over them, it made them inaccessible.
Larger things that I needed to get out of the bag often like my water filter and lunch / snacks went in the sleeping bag compartment.
I used the main bag for extra clothes, game bags, and anything else I didn't need to get at in a hurry.
I have the standard lid. After the first day in daypack mode I left it at camp.
Instead of a grab-it or the cargo panel I bought a load sling from a different company. It is taller than the grab-it, lighter than the cargo panel, and less expensive than both. It fit my Duplex frame great and worked very well for hauling bags of meat.