After I had bought myself some time ago before the front pockets, I also bought 2 years ago for the wheel my wife ever Back-Roller bags. Now I also wanted to refuel again for my bike, so we are prepared for backcountry trips. The bags are really worth its price: Even after several years of use, I can (also thanks to appropriate care) do not realize that the material is cracked or porous. The closure so far wrapped properly and the bag is not full - even if one unit time in a strong rain, the bags are still tight. The click system for attaching the bag is really good. With one hand and handle the bags are dissolved or attached. The trailer system was also decisive for the purchase, since you can use the bags also laden fast. The previous system did not allow the pack because the bags were fastened too complicated and also lose weight too bulky / too difficult to fast were.
Since it is not clear from the article description: This is a couple - so two bags! For Ortliebkenner is that perhaps to recognize the fact that is spoken by 40 liters packing volume.
