Ortlieb, now that I am figuring them out.
My new Packer-series (BikePacker rear, Sport Packer front, in cordura "Plus" fabric purchased 2011) have fabric caps over the double-drawstring closures at the tops of the bags. If you fill the bags just to the top of the hooks, then use the drawstrings, the cap-tops serve as secondary pockets.
I often shed and add clothing throughout the day (wind jacket, lightweight fleece or wool over-jersey, tights, arm/leg warmers, etc.) and these now tuck neatly under the top-caps. They'll stay dry in most circumstances, but it is little extra effort to stuff them into small nylon drysacks before tucking them under the caps. I store my off-bike shoes this way (a pair of nylon mesh Merrell "Breeze" clogs). At last, I've got quick access to my rotating daily clothes selection and I can respond quickly if I get overheated on a hill or a cold front rolls in while I am riding. For me, this makes the Packers more attractive than the Rollers, plus the rolled part seemed like a lot of extra weight/unused fabric when it was er, "rolled". I can see the advantages of the roller design, however, and may well wish I had them come wet/winter touring, when I lay my bike on its side at rest stops (Click-Stand to the rescue, 'soon as my new Sherpa arrives and I can take accurate measurements).
Also, wrt the Ortlieb inner envelope pockets...if you put stuff in them and then fill the bags, it is devilishly hard to access those same slim pockets. I've found a far better solution is to flip the inner pockets up, fill the main compartments, and then lay the pockets atop the load in the panniers. That way, you can access the pocket contents without having to dig; just open the lid and there you are. Great for first aid kits, etc. The pockets can also be folded under/in half, essentially making two main pockets and one additional zippered mesh pocket right under the lid. Pretty much solves all previous objections I had wrt to Ortliebs having "no" pockets -- they do, just well-disguised. Add the Packers' cap-top "pocket" to the folded-over envelope pocket with the zippered mesh compartment, and each bag has essentially four pockets plus the main "bag".
My current-model rear BikePackers each have an additional formal outside box pocket with roller-fold lid that is tensioned shut with the compression straps, adding two more pockets per pair. For what its worth, I keep my toilet paper in one of these, and it stays both handy and dry.
I also have a second pair of mounting hooks on each rear bag as well as a second set of the stabilizer "fins". They further stabilize the rear bags and keep them from rattling, and are a nice way to store spares that can be pressed into service on any of the four bags I carry; a great way to carry spare bag hardware without eating into storage space. Makes theft a little less convenient as well, and if I should fall/slide enough to break even a pair of hooks on one entire side, I will still have a complete set of spares ready to go.
I always, always, always use external nylon webbing compression straps with all my panniers, putting one vertically and another horizontally around the bags. Mine deploy and release easily thanks to Fastex buckles, and completely address the issue of second-order vibrations, making the load silent and life much easier for the racks, hooks, and fins on rocky tracks and extreme trails. Handling is improved as well and yes...there is that added bit of trouble for someone wishing to open or remove a bag to steal the contents. Go to: http://giantloopmoto.blogspot.com/search?q=daniel+wood
and you can just make out the compression straps I used on my front bags (an old set of rear Kirtland TourPak panniers mounted on Thorn Low-Loader Mark V front racks on my Miyata 1000LT) on last year's ride. The rear bags are ones I made, and I didn't use compression straps on them but wished I had. You'll also see how I had to tuck my shed clothing under my rack-load straps so it would be handy when needed. All this is much neater looking and secure against rain when tucked under the Ortlieb Packer top-caps (see photo). The same panniers and racks shown on the Miyata in the photo will be transferred to my new Sherpa when it arrives and I expect the load to be arranged in a similar fashion.
Hope this helps,
Eugene, OR -- USA