The article on the Atom-Wate pack is interesting, because it mentions new pack designs from Europe, so they were clearly tuned in to the latest equipment. Byrd Cloth was a twill made from Egyptian cotton, and a high-tech choice for that time. Aberlite was a lightweight tent canvas, similar to using silnylon or cuben for packs now.
The pack reminds me a bit of the G4.
We think of Green-Bar Bill as a traditionalist, but it sure looks like he had more in common with the minimalist, lightweight approach than with the car camping, kitchen sink style.