A super interesting backpack released in the early 00s that uses steel quick-release buckles in order to separate the vest and bag, simpler versions of these buckles are used to keep the lid of the bag fastened shut. This has a total of 5 compartments, i'd say this bag is somewhere in between 30-35L, which is more than big enough for most people. This has some minor wear but all the straps and mechanical parts are fully working.