The Lost Coast 60 Pack (3356 cu in) size medium fits waists/hips up to 33 inches.
This pack is top loading only.
I think you'd be happy with any of the hydration systems we have - Deuter, Camelbak, Osprey, Platypus, Hydrapak, or Geigerrig. They all make a 3 Liter reservoir that I would recommend for such a long hike. They all have their advantages over the other ones. Sorry to leave that so vague, but feel free to ask more questions if you need to.
The Boreas sales manager recommends no more than 45 pounds, with a target of 40. If you took the frame sheet out, he would not recommend more than 30 pounds. Hope that helps.
The Torso length is the more critical measurement for a backpack. Since you fit in the large torso, I would recommend that size. You will have no problem fitting the large waistbelt since there is plenty of adjustment. They don't give waistbelt specs, but since I am a 32 waist, I tried it on and it fits just fine.
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