OK, Eric posted his Brain Box Mount for his Vendetta, so I will post mine too. I'd guess that Eric's is lighter than mine, but mine requires fewer skills to build! Mine supports the Brain Box from the bottom, like a tray. I don't use any of the Brain Box mounting flaps or materials at all. I've ridden a few hundred miles with it and I am very pleased. It does not move around at all and I've carried two 70 oz camelbak bladders weighing about 10 lbs inside the Brain Box. First, I cut a paddle shape out of a piece of hardwood plywood that I found laying around in my garage. The handle part will insert into the Vendetta frame under the headrest tubes. The paddle part is the same dimensions as the Brain Box. I also cut a skinny piece of wood to reinforce the handle and to provide a snug fit into the Vendetta frame. I just used wood glue to attach the two pieces of wood. I had to shape the handle a bit with a sander to make it fit into the Vendetta frame. The bolts you see in the photo above are to help hold the handle to the frame. There is a flat piece of metal on the top side of the headrest tubes. The bolts are used to clamp the handle to the headrest tubes. Once this is done, the paddle doesn't move at all. Here's a top view of the how the bolts connect. That flat piece of metal is actually a short piece of electrical conduit hammered flat. I wrapped it in electrical tape so it wouldn't scratch up the headrest tubes, and also to provide more friction. I had to cut it diagonally on one side because there was a little interference with the seat. I used wingnuts so I could easily remove it. Finally, I painted the paddle yellow to match the bike (well, almost). The yellow paddle increases rear visibility, I think. I drilled a few holes in corners of the paddle to put some wire though to hold down the Brain Box. I also attached a bar where I can mount some lights.