Does the EPI Speedy sag???

I have an Epi Speedy 30 purchased in 2007 that sags in the middle because my things tend to gather in the middle of the bag. I've seen some sellers on eBay who have developed bottoms for the bags to help them keep their shape. I am considering buying one if the sagging gets worse.....:hrmm:
 
It hardly sags but I still put a rectangular computer mouse pad to make sure it stays flat. For some reason, I always get free mouse pads and so I found a way to make good use of them.