When you remove the stock air box and replace it with a Rottweiler intake, there is a huge gaping hole (above the valve cover and behind the radiator). This bag fits that hole perfectly. I fit the factory tool kit, a 21" heavy duty tube, 4 pack of CO2 cartridges, a Moose Racing tow strap, and I STILL have a bunch of room. Might even be able to still fit a 18" rear tube in there... (couldn't fit my Moose tire irons, I'll have to find something shorter). Bottom line, this thing has a HUGE amount of space in it. You will be surprised how much you can fit in there.
As others have noted, it will get warm considering its right on top of the valve cover and right behind the radiator. And a stiff/hard floor might be a good idea.
Two thumbs up!