This was purchased by my Dad probably in the early 90’s.  Not used much at all.  Weighs 4 lbs 14oz.  Beyond weight “penalty” territory  but huge and built so well.  Adjustable torso, detachable top, zippered bottom compartment, side pockets.  Somewhere > 80 litres capacity.

Similar to this one but all the features appear the same.https://www.worthpoint.com/worthopedia/mountainsmith-frostfire-ii-pack-442886457

Shipping is going to be an obstacle.  Looks like it could be as much as $25