My documentation that came with this must assume I know what I'm doing or that I know about backpacks. I bought this along with a hydration unit but I have no idea where the hydration unit goes and how the hose is snaked to me. Any clues -- detailed please?
One of the reasons I bought this bag was because I can take the top back off completely and presto ... you've got a nice day-pack. The top bag also has a built-in lumbar strap so you can use this as a belly-bag.
I can't think of one larger that I'd want. Turns lots of weight into nothing.