I'm looking for a women's hiking backpack, but have had trouble finding one that fits me. My torso length is 20", which puts me at a medium or large depending on the brand, but my waist size is a xs or small. I've tried Gregory packs since you can get the smaller waist belt, but the pack still keeps riding up. Has anyone here found the perfect pack for a woman with a long torso and a super skinny waist?