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Check out the REI trail 40. Read some reviews and go try one on. I just got back from a 4 day solo and love this thing. Just enough space, about half the weight of my kelty trekker 65 (also a great pack btw), and can carry a lot more than the 50l rating implies. I had my whole sleep kit (bag, pad & liner) strapped under the pack with the integrated lash straps (frees up a lot of space in the pack). Super affordable too.