DOES THIS YOUR PACK MAKE MY BUTT LOOK BIG?

In Yuma I bought a '60s tour pack, don't know if it was Harley made or after market but it's very wide as you can see in one of the pics. My good buddies lured me away from the garage for a few minutes, when I returned I found something was added to it. Can you make that out?  Hope so.

I have to admit that thing does look, um, a bit different, but boy is it nice to have!