I'd wait for the X. I love my Exo K3 4800, but the weight is the only downside. I also have a Kuiu Pro 4000 and it's more than 1lb. lighter. I started my sheep hunt in Aug wiht the Exo, but ended up switching to the Kuiu about midway through to cut my overall weight. I did miss my Exo when it came time to strap meat down and pack out. The side stretchy pouches on Exo are way better, but I do like the integrated lid of the Kuiu. Maybe the K4X lid will be light enough and worth running. I've rarely run the lid on my K3.