I'm a 6'2", 21 year old male who is new to the backpacking community. I just bought a pack at an REI used gear sale but the fit seems a little off. It's a Medium Osprey Atmos 65. My torso length is 20.5" and the hip strap is about two inches too high and wants to ride up to my waist. Does anyone have any suggestions on how to make up the extra two inches (the straps that pull the shoulder straps up to give more torso length are at maximum)? If I'm out of luck there, are there any backpacks that would fit my frame better. I'm really thin.