That's really cool. But there are too many bags. I still prefer one bag option, and those water proof panniers are really heavy. I will get a s frame and try strapping the 50 L pack horizontally. If that's too much for front, I will strap a 30L pack with all the heavy but not bulky stuff, and carry the 50 L on my back with bulky but light stuff like sleeping bag etc. Both my 30L and 50 L bags are ultra light frameless packs (Terra nova) they weight around 400 and 500g and basically look like plastic garbage bags so I can stuff the 30L into 50L easily if there is not too much stuff. The last resort (if carry the pack on my back is too hot or too heavy) may to get a rear rack and strap one of the bags there.