If you select the brown/yellow colours, and then click to get the bigger picture (aw heck, here's the link!
CLICK ME) you'll see what appears to be a loop running diagonally up the side of the bag. You could probably hang your tripod by the handle, or even run a leg or two through there. I don't see any actual attachment points, though...
Maybe send them an email and ask if there are any attachments or riggings not shown for such a thing. There may be slots or something on the bottom, through which nylon webbing could be run, creating a flexible (and removable) attachment system for carrying the tripod horizontally. Let us know what you find out.