I had the "Jumbo" Saddleman Drifter Slant bags on my Valk for awhile and, even though they were "Jumbo", they still looked small on the Valk. Also, I could never get them to hang straight...always drooping in the back. Also, I had a problem with them cracking the back wall where they connected...I believe this was because of the way they hung on the bike. The chrome fender rail caused some stress in the bag right where the buttons went through the bag. Plus it was the left side both times that cracked...which is the side that hangs away from the bike when on the side-stand. To Saddleman's credit, they did replace them twice for this problem without question and beyond the warranty. All I had to do was send them the broken bag. The 2nd time, I was in the process of building my hard bags, so I sold them without even opening the box.
Here's a pic of my Valk with these bags:
