I ordered this backpack because my old one, also 35L, was falling apart and, going by the photo, this was the closest I could get to it from any supplier. However, when it arrived it was TINY compared with the old one. I cannot believe that it is 35L. I have meanwhile bought a 28L one in a shop, which can easily take this one inside its main compartment, with a few bottles and clothes as well. How do you measure the capacity, as this one doesn't seem right. Also, perhaps it should be photographed next to something of a recognisable size so that one can tell at a glance how big it is. Sorry to be negative. In itself, it is OK. But it is not what I expected.