Bought a used military rucksack from a want ad off another website. I am hoping this will be comfortable enough for my DIY mule deer hunt in NM (if I get drawn). It was only $50, so I don't think I did bad? I am hoping that if it was made for the military, it should be comfortable enough for my 5 day hunt? Has anyone had any experience with this rucksack? My research shows that this is the military upgrade from the old Alice packs that have been around for a long time.