If you are riding an Ogre, a few grammes of pannier fabric are nothing to worry about.
For racks, it is hard to beat Tubus. I use the Tara up front and my old Blackburn at the rear.
I mix it up with panniers, some old, patched Carradice Super C at the rear and some of the fancy all-white Ortleib rolltops in the front. To avoid heelstrike, pick one with a heel cutout profile, not a simple square cut.
I use Ortleibs for food; you can rinse out leaking pesto sauce with detergent and a hosepipe. The white colour makes it easier to find stuff.
Note that quick-release, locking hooks need to envelope a single rod of metal on the rack . If the rod is dual side-by-side welded, you cant use the hooks. You may want more than 2 hooks per bag which is easy to fit onto the pannier rail. If you have fenders you don't need a solid top-plate. Open racks are more versatile for lashing bits on. A rear lamp bracket under the rack is good. You need 3 legs, preferably fully triangulated.