That's how I've been rolling for years: 2 Ortlieb sport-packers onto a Tubus Tara in front.
I use a Carradice Nelson LF in the back for stuff I access often during the day (wind vest, sun sleeves, raingear, the food I'm buying before camp), it's rain-proof and expandable.
The rear rack also supports occasional firewood loads at the end of the day, or a filled up 4L Dromedary bag for my camp water in case of dry camps.

I also have the Ortlieb handlebar bag for the valuables, electronics being charged, and the snacks I'm munching on while riding.
The panniers don't get opened until I reach camp.