Be careful not to cinch your pack's waist strap too tight. I am tall and thin with bony hips. I kept my backpack's waist belt tight to carry the weight there rather than on my shoulders. (My pack weighed somewhere between 15-20 pounds (7-9 kg), and I weigh 130 lb.) In Leon, I began to notice tingling in skin on outside rt. thigh. Over time, it became a burning sensation, painful, numb, tingling, etc. on and off, even sometimes when I wasn't wearing my pack. I walked in Sept. 2014. It's now six months later and I still have a numb section on my thigh. My doctor says it could be permanent, likely due toMeralgia paraesthetica from a pinched nerve in the front of my pelvic area. Not a big deal, but a bit disconcerting.http://www.google.com/url?sa=t&rct=...29ysdwkoc2dRdLTbQtdm2eQ&bvm=bv.88528373,d.cGU