NIce one, I've had the tail bag for about 2 years now and it has never let me down.
Although one note, you need to roll the end downwards, not up otherwise the water will pool in the fold.
That set-up is all you need for touring solo. And the beauty is you can put it on your next bike. You don't need to buy new stuff. Just one question. What size is the bag on the rear seat, please? 20 or 30L?