a rotating or twisting mode enabling this portion to move with the hips of the wearer fastened to this flexible lower portion 80 is the waist support member 35 which as is more clearly seen in fig4 is an elongated curved member of semi rigid plastic which includes a plurality of fasteners such as screws 82 which are fastened to mating fasteners in the 34 beaver tail 34 portion 80 of member 22 also fastened to member 35 are a pair of snap fasteners 84 which provide means for attaching the waist pad members 36 and 38 in fig4 member 38 has not been shown in order to delineate the mounting means for the web belt member 42 which is secured to one arm of member 35 and is anchored through slots 86 87 web belt member 40 is similarly anchored to the arm on the left side of waist support member 35 with this arrangement the entire waistband structure is mounted somewhat flexibly with respect to the remainder of the backpack frame and is enabled to move with the wearer 39 s hips backpad member 34 includes straps 64 and 66 which pass through slots at the upper edge of frame member 22 and near the lower portion of frame member 18 and the straps are then buckled at the rear side of the backpack as shown in fig2 member 92 is a lumbar pad which overlies the center portion of waist support member 35 and which includes a plurality of straps 94 having buckle fasteners for fastening itself to frame member 22 since the lower portion of straps 94 are fastened to the flexible 34 beaver tail 34 portion 80 of frame member 22 it will be recognized that the lumbar pad 92 will also move flexibly.