For the 10.5" model, the smart cover adds 50% to the total weight (not double). I carry my 10.5 + keyboard in one of those 2oz ultralight backpacks from REI,

For the 10.5" model, the smart cover adds 50% to the total weight (not double). I carry my 10.5 + keyboard in one of those 2oz ultralight backpacks from REI, so the total weight is well under 2 pounds.