I bought this backpack to pair it with the Wisport Zipperfox 42 model. Its big advantage is the expansion options, especially the zippers that allow a module in the AVS standard to be attached quickly. I also view the use of plastic plates in the shoulder straps as a plus, as this should clearly improve comfort during long periods of carrying a heavily loaded backpack while also allowing the use of thinner, less heat-retaining cushioning foam. The overall workmanship makes a good impression, and the number and placement of the bar-tack stitches indicate that the backpack should easily withstand at least several years of use. The capacity matches the claims — the main compartment fits a winter sleeping bag, such as the Carinthia Brenta or a similar one, but beyond that there is already very little room left. A downside, however, is the stiffening back plate, which, along with three aluminum stays, is part of the frame. It cannot be removed because it has been sewn in permanently, which will make washing the backpack—after all intended for intensive field use—much more difficult and perhaps even impossible. In addition, its curved profile may not fit every user's build well. Another drawback is the quick-release buckles for emergency doffing of the backpack. Although the solution itself is an interesting compromise between a ROC buckle and a Fastex buckle, under load they produce a squeaking sound. I would not call this a genuinely dangerous noise, considering the ordinary sounds that accompany moving through the woods, but after just two hours of testing in a fairly quiet forest, it proved irritating enough to deserve a mention in the review. In the context of the design assumptions, another downside is that, unlike Wisport, Direct Action (Helikon) manufactures its backpacks in Vietnam.