my osprey exos 58 works well for a 10 day trip, with an ursack, but is very heavy, can approach 37 to 40lbs, depending upon camera/photography goals.

It can take the bv500, sideways on top, but it's tough to fit 10 days.  The good news is it gets lighter everyday (captain obvious here).  But the bv is required in most of the sierra np's.

I think it's a wonderful pack.

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