Think I am leaning towards the DT2 now.
You can always compress but never expand a pack beyond its normal CU. Keep that in mind.
I picked up my DT3 on Friday and so far I love it. I took it out with a 30# load for a 10 mile training hike in Rocky Mountain National Park this morning, and it performed flawlessly.
Here is a photo of the DT3 with just the small waist pockets (about 4,600 ci)
View attachment 2412
And here it is maxed out with two large pockets and a medium pod (about 6,600 ci)
View attachment 2413
I can't imagine needing more space, and with my Grab-it and lash kit I can attach an elk quarter to the exterior if necessary.