Tony, the Ohm's pockets are big. They might look small, but they're big enough to hold a 2l Platypus, energy bars, head torch, without anything falling out. I've been climbing and bushwacking with my Ohm and never had the problem of a bottle falling out. The secret is that they are tight.
Re: Adjustable Torso Length, I see your point. However, for me that is still not an option. I measured my back, three times, asked existing Ohm owners for their opinion on the forum, and got a perfectly fitting backpack as a result. As I am not wearing that many more layers during winter the Ohm will also then be the right size (I'll be wearing a merino baselayer, a smock and if its frigid a synthetic jacket on top, which will be maybe a centimeter or two thicker than what I wear in spring/ summer/ autumn). YMMV.
Re: Ohm Compression, in my opinion the best there is. Compresses the bag evenly and without letting anything move around inside.
David, I think if one measures well and shops around, one might be able to find a good fitting bag. I reckon that for some people an adjustable Torso is a blessing, for me its unnecessary weight. You always could MYOG a backpack, you know ;)