I have lots of surplus packs, but there are two that I love and cherish. For big jobs, I have a version of the legendary Swedish LK-35. For everything else, I carry the nimble, gorgeous Swedish M39, the “Moose Sack.”
Like in Switzerland, Sweden’s neutrality is very much an armed neutrality. Even though Sweden did not fight WWII, they kept over half a million men under arms. And since the Swedes knew a thing or two about the outdoors, Erik and Oskar were issued a rucksack that is a work of genius. You can recognize it anywhere by the strange, perforated, leather-covered crescent shape at the top, which is a godsend for comfort.
As its backbone it has a peculiar X-shaped frame. It holds the pack close to your back without quite touching, and the top of the pack moulds itself over your shoulders, so it is pleasant to carry and makes you feel quick and light. In addition, the pack “grabs” the body firmly and stays put, with minimal slipping, flopping, or bouncing. On a heavy march, that saves energy because you don’t have to hold the pack still. And it feels more ergonomic and somehow more agile than something with a rectangular frame. You can also adjust the ride height and even the spacing of the straps on your shoulders!