Had a brief chat with MR. They say that towards the end of 2017 or beginning of 2018, they will begin selling hunting packs minus the frames, so if you have a Marshall, Metcalf, Pintler, or the new on on the Guide Lite Frame, you can buy another pack to put on there too. Looks like they will be offering the Metcalf, the Pintler, and a new unreleased pack as "pack only" options. Not the Marshall or the new day pack one that just came out. I tried to find out if the unreleased pack was Marshall sized, but couldn't get any info.