This year one of my out-of-state hunts will be for mule deer in NE Wyoming when there probably will be snow on the ground. I may not be able to shoot prone so I am brushing up on my sitting-bipod shooting technique for a 700 yard shot at the monster mulie. A few years ago on the internet I saw a sling made for sitting shots. It does not attach to the rifle. It had 2 loops for attaching around the legs at the knees. The main part of the sling's strapping wrapped around the upper back. The whole system ties the crossed legs and upper torso together for stability. Anybody know where I can find the web site?