The ELR Pro is made for shooters who like to use their support hand to pinch the stock through the bag. It’s a little taller than the ELRx and uses our exclusive locking fill. We use less fill on these which leaves room inside for the support hand to get in and pinch the stock. Both straps are adjustable to allow for a perfect fit. We recommend less experienced shooters go with the Rx, F1, or 3D.