Just looked at a picture of an '07 and looks to me like there should be plenty of room to put a bag on one without blocking the vents. Unconventional sources might be soft sided tool bags/pouches found at Home Depot, Lowe's, hrdwr stores, etc. There are actually some good looking ones. Or say small soft sided pet carriers. That's what's on my Xciting.
![Wink ;)](https://www.kymcoforum.com/Smileys/default/wink.gif)
If there's any metal underneath the floorboard, you might could use magnets to hold it in place.