Okay, I have spent the past hour and a bit searching for info on ammo boxes. I was at my local gun range tonight (shooting 44's, 357's, 38's, and those lovely 22 Singers) and a friend of mine had a military ammo box. He claims that there are ammo boxes very similiar to the size of motorcycle aluminum panniers. He said that they would way around 10lbs, each. I knew that I had seen a pic of a KLR mounted with ammo boxes, but do you think I can find it online? Notta chance. Horsizons Unlimited have lots of "hit" but not a single photo. I know they would be heavier than aluminum panniers and I would be stuck with their fixed shape. I just want to weigh all of my options before I order my aluminum.