I love the Exos series. My son and i switch off between the Exos 58, a Golite Jam 2 and a Kelty White Cloud pack, depending on the trip length and terrain. I agree that the Exos IS an external frame pack with the frame on the outside. Well, maybe it's a hybrid of the two types. I have always been an external type of guy until recently and the Exos is extremely comfortable for carrying larger loads (just like an external).

BF cool
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Hammockers aren't stuck up, they're just above it all.