Osprey's stripped down, streamlined and svelte Ariel Pro is made for type-two adventures that span days or months; alpine climbing expeditions with remote basecamps, or boundary-pushing thru-hikes through unknown landscapes where the only trail is the one you make. WIth one zipper and strengthened hardware, this pack provides inspiring dependability. The hipbelt and harness are interchangeable, and the hipbelt can be custom molded to achieve a fit that's as perfect as this pack.