Abstract: A backpack comprises a front panel adapted to lie against the back of a wearer of the pack, a vertical guide rail fixed to the front panel generally centrally thereon, and a pair of cushions flanking the rail, secured to the panel, and projecting forward therefrom past the rail. An upper slide displaceable vertically along the rail is provided with a latch for arresting it at any of a plurality of locations therealong and shoulder straps adapted to engage over the shoulder of the wearer of the pack have upper ends secured to the upper slide. A lower slide displaceable vertically along the rail is also provided with a latch for arresting it at any of a plurality of locations therealong and a belt adapted to engage around the torso of the wearer of the pack is secured to the lower slide.