Most any bag in the small to medium size should work ok.  I have had both and no problem.  I highly recommend saddle bag supports though.  I didn't have them on my first Savage and the bags chafed up the bike pretty bad.  I made the set I am using now.  It is not hard but requires a bit of ingenuity.

Paladin. wrote on 12/31/69 at 16:00:03:
Those are big enough for bodies!  

Bobster wrote on 12/31/69 at 16:00:03:
I don't do cage if I can help it.  I far prefer riding home in the rain to driving home in the sun.  One saddlebag can hold two gallon jugs of milk, or a 10 pound sack of potatos with a couple pounds of onions, or a five-liter box of wine.  (I used to hate the fuel costs of going to the store in the cage for a couple of items.)

Soft versus hard:  hard bags cannot be over-stuffed.