I use a DT2. I assume you have a frame? If not, you'll need that first.
I don't use a lid or grab it. Don't need it because the pack itself is more then big enough for 5-7 days of stuff. I would recommend a set of pullouts to organize your essentials as stated above. Other then a frame, I'd mock up and do some runs with it before buying a bunch of stuff you very well might not need.
I don't fret the weight of things I take with me. But, I don't purposely add 2 or 3 pounds of unneeded storage or carrying capability. Since the pack has enough built in