The LJK rucksack was launched in 1985. Originally designed for military use, the rucksack was also warmly received among civilian users. The special features of the model include a frame without the top curve, which makes moving easier since it does not get in the way of the head. There are no pockets on the sides of the rucksack in the bottom section, which makes cross-country skiing with the rucksack more comfortable. The LJK rucksack is still used in the Finnish Defence Forces today and it is equally popular among recreational users.
A traditional external frame rucksack is at its best with a heavy load but is equally suitable for lighter outings as well. The external pipe frame allows air circulation between the bag and the back of the user, reducing the heat load significantly. Although anatomical rucksacks have taken over some turf in the rucksack market, there are still situations where nothing beats an external frame rucksack.