Internal frame backpack

摘要

A backpack is disclosed having a sack including a stowage compartment and a frame holding compartment comprising an envelope having a front wall positionable against the wearer's back. A flexible unitary frame is positionable within the frame receiving envelope, under compression, and longitudinally tensions the front wall of the envelope. The unitary frame includes curved end portions interconnected by a pair of inwardly bowed, generally C-shaped side portions. The curved end frame portions fit the like curved closed end portions of the frame receiving envelope. The flexible frame is arcuate longitudinally and has a concave intermediate portion thus allowing inward movement of the tensioned front wall when contacted by the back of the wearer. Movement of the tensioned front wall causes the backpack to "hug" or closely fit the curvature of the wearer's back and thus moves the center of gravity of the backpack closer to the wearer's back to improve backpack balance. The portion of the front wall in contact with the wearer's back is formed from an open weave mesh allowing air to circulate over the back of the wearer.