Your talking about my Pack frames. I am still learning how to sew and haven't decided what I want the Bag part for those two frames to look like yet. I am working on the Pack Bags for the Pack Frame/Sled first as I want to try it in the snow somewhere this season. As far as the other 2 frames go, the lighter one will use the 4 upright supports like pack stays. They will be sewn into the pack bag. This Pack will be a part of an ultra-lite setup for a summer AT Thru-Hike of 100 trail days, more or less. I want to keep the pack bag off my back as it has to be much cooler. I expect the finished pack frame, straps, and bag to be in the 16oz range maybe a little less. The model for the first frame was an old Army Ruck Sack frame that I have. The second frame was trying to make the 1st one even lighter.