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I learnt from (one of Mike's videos perhaps?) that it's better to have more space than you need because if you're at the very limit of packing capacity or if everything has to go in your bag 'just so' to make it fit, it's a pain in the arse to do quickly. Ergo, have excess carrying capacity.
The stuff I needed to keep dry, like my down jacket and bivvy, were in drybags in the saddle bag. The stuff around it just stayed wet.
hippy-
Yeah, I saw that video too, but I didn't want to get another saddlebag!
Main prob I had was that two things I ended up using a lot, my pump and my legwarmers, had to go in my saddlebag as no room elsewhere.
I'd thought mine (Apidura) might be waterproof as it had been fine in showers, so the plastic bags were just extra insurance. The Croatian thunderstorm would have penetrated anything though!
frank9755
Might not have been an issue for you but many people do find the tailbags a pain to access. Mine was as it was slightly too small for what needed to go in there.
Also mine had dry kit. I used loads of poplyrhene bags to keep things like down gilet dry - would be better to have something fully waterproof.
Basically, it looks weird but it might have some usability advantages.