I'll check. I just put the side bags back on mine. I've always run the top case. I can put a full-face (XL) helmet, FXRG gauntlets, sunglasses and my chaps into the top case with no issues. It's much larger than you'd think.
I do know that you can fit an unopened case of beer and two 10lb bags of ice into EACH side case, though.
I put aset of removable hardcase side bags and brackets for my Ulysses for about $525.00 they will hold a fullface helmet and more 42 liter GIVI bags twistedthrottle.com
if you guys are are interested in different bags and you already have the stock buell baggs i was told any hepco and becker (they make the buell baggs)bag will fit the mounts and use your key if ordered with key code. they offer a pretty sweet assortment of baggs and all the replacement parts.http://www.amotostuff.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=hepco_becker
Of course you need to be carefull what you put in them. My plastic hinges as broken twice on both my side cases. I now just use a strap around it to keep it closed.