First time I've ever heard a defence of vario luggage based on its low weight.
They are unbelievably heavy, have very limited capacity unless you open them up to make them three times as wide as the bike, open on the side and will never survive being thrown down the road.
The only things they ever had in their favour was that they integrated with the bike well (which only really mattered when you took them off) and they looked good (which went away with the launch of the 1300, since then they look like Shad's worst efforts).
For a trip to Tesco, varios. For anything that involves even a sniff of dirt, tins or bags...