Abstract: The invention relates to a backpack (1) comprising a bag (2), a frame (3a, 3b, 5) secured to the rear face (7) of the bag so as to form a dorsal plane (9) having a pair of straps (11a, 11b) slidably mounted thereon, and a belt assembly (13) having a bottom portion (15) arranged to be held around the waist. Link means (17, 19) are arranged between the belt assembly (13) and the pair of straps (11a, 11b), together forming a dorsal holder element (21) arranged to enable the belt assembly to be slidably mounted relative to the dorsal plane. Suspension support means (23) are arranged between the bottom portion (15) of the belt assembly and the bottom portion (25) of the dorsal plane in order to retain the bag by keeping the dorsal plane pressed against the back and by damping movements of the bag relative to the dorsal holder element.