A backpack with a torso length adjustment mechanism is provided. The backpack includes a holder fixedly connected to a bag, a mesh back support having a back mesh contactable to the back of the user and a supporting element for spacedly supporting the back mesh on the holder. The backpack includes a shoulder strap length adjusting mechanism having a force transmitting element for transmitting a force from the holder to the shoulder straps of the backpack. The force transmitting element is lockably movable on the holder between a first position in which a size of the shoulder straps is the largest and a second position in which the size of the shoulder straps is the smallest. The shoulder strap length adjusting mechanism includes a locking mechanism at the holder for releasably locking a movement of the force transmitting element.

A backpack with cooling and temperature-lowering functionality, which includes a backpack main body with a cavity and shoulder straps. A ring-shaped flexible protrusion is set on the back of the backpack main body, upon which is a flexible support for contact with the human back. A chamber is formed between the back of the backpack main body, the ring-shaped flexible protrusion, and the flexible support. A cooling unit is located on the outer side of the ring-shaped flexible protrusion, comprising a housing that is detachably mounted on the backpack main body, a TEC cooling plate located inside the housing, and a fan. The housing has a cold air nozzle that is inserted through the ring-shaped flexible protrusion and extends into the chamber to input cold air, thereby cooling the human back and making the user feel more comfortable.

The present disclosure pertains to an exercise rucksack designed to facilitate a variety of physical fitness routines. The rucksack includes a base, a top spaced from the base, lateral sides extending from the base toward the top, and a front panel coupled to the base featuring a handle for farmers carry exercises. A back panel is coupled to the base, the top, and the lateral sides, equipped with an interior and an exterior side. The rucksack incorporates at least one pocket assembly on the back panel's interior side, structured to securely hold a weight plate and a water bladder within distinct compartments, each with a closure mechanism. Shoulder straps are provided for wearing stability. The rucksack is further enhanced with multiple handles positioned on either side at the top for varied carrying options, supporting a wide range of exercises and user convenience.