All 2st Solution to IMS gas tank gap?

I saw this at a bike store and the light bulb went off. went home and measureed...sure enough exact PERFECT fit. I mean you put the bag undeath the tank and it fits so snug it wont move. Of course I zip tied it down good to the frame. Now I gots me another spare space to store extras. Its a tad tight but workable. I got spare tube int here, couple c02 canisters/filler and spark plug and wrenchs and still theres room. No rattle or worries about it with radiator heat after my first ride. No issues.
I "believe" this is the same one I bought but not %100 sure.
http://www.axiomgear.com/products/gear/bags/handlebar/adirondack/

It's unfortunate that there is a gap that size. But, fitting usable parts underneith seems to be the positive side of the situation. I filled the gap with foam just so it didn't stare at me. Maybe on long rides, this will be a useful option. Thanks.