Well now. Thanks! This does indeed give me something to chew over for a couple days, then I'll get back to you. Seems to accomplish much the same thing as the Synpack, but with innovations allowing, among other things, the view of one's feet. Hadn't thought of that.

Now the big question, can the front part of this system be added to existing packs, like the Syncpack, or is an entirely new system required? I'll pick through that entire site to find out.