BTW, for those using a Highlander or Tara as a compression panel, definitely try to scare up an extra G-hook or two to use as a pulley on the compression straps--I think you'll get both a better "wrap" around the packbag, and maybe some extra cubes in the HPG bag itself since its circumference isn't being choked down.
I didn't understand the proper use of their compression panel until a few months ago. The G-hook should hook onto the side of the Tara/Highlander panel, then route through a Looploc (these are already in place on a Longhunter frame above the plastic triangles that the chair hooks to, and there is a nylon loop sewn to the frame about ten inches below that can be used similarly buy adding hardware. Then the strap goes back around the entire pack, including the panel and its contents, pulling the load tight. Just attaching fastex buckles to the side of a daypack doesn't achieve the same result. A "dock & Lock" system like Kifaru's requires a heavy codura pack with PALS and it STILL moves around. The HPG method bypasses the pack and goes directly to the frame.
With a G1 LH frame with KU laminated stays, HPG harness/belt, silnylon packbag, Tara Pocket with compression kit, mine weighs an ounce shy of five pounds
The Hills say the inspiration for this is the age-old Trapper Nelson lashing method that was used in days of old. It worked then, still works today, even better with modern materials. If you are the type that loads tools in the back of a truck with a hayfork, this likely won't appeal to you.