A suitcase comprising a back shell and a front shell, both of which being made of a rigid material; the back shell is configured with a substantially flat back base and a perimetric back wall extending upwards from the flat back base, and the front shell is configured with a substantially flat front base and a perimetric front wall extending upwards from the flat front base, a planar footprint of the front shell is slightly greater than a planar footprint of the back shell; a flexible perimetric closed-loop side wall of the suitcase is attached along one of a back edge and a front edge of the flexible perimetric side wall to one of a perimetric edge of the perimetric back wall and a perimetric edge of the perimetric front wall, respectively, with the other one of the back edge and the front edge of the flexible perimetric side wall being articulated to an articulation portion of the other of the perimetric edge of the perimetric back wall and perimetric edge of the perimetric front wall, the flexible perimetric side wall comprising a sliding closure along a reclosable portion that extends along the edge of the flexible perimetric side wall that is articulated via the articulation portion, the sliding closure extending along said entire edge of the flexible perimetric side wall excluding the articulation portion; the suitcase is configurable between an expanded position and a collapsed position, wherein at the collapsed position the perimetric front wall accommodates the perimetric edge of the perimetric back wall and wherein the thickness of the suitcase at the collapsed position corresponds with a height of the back shell and a thickness ( t) of the front base, and the flexible perimetric side wall is folded inwards into a space extending between an inside face of the back base and an inside face of the front base at the collapsed position, and at the collapsed position the perimetric edge of the perimetric back wall substantially bears against the inside face of front base. the back shell is configured with a substantially flat back base and a perimetric back wall extending upwards from the flat back base, and the front shell is configured with a substantially flat front base and a perimetric front wall extending upwards from the flat front base, a planar footprint of the front shell is slightly greater than a planar footprint of the back shell; a flexible perimetric closed-loop side wall of the suitcase is attached along one of a back edge and a front edge of the flexible perimetric side wall to one of a perimetric edge of the perimetric back wall and a perimetric edge of the perimetric front wall, respectively, with the other one of the back edge and the front edge of the flexible perimetric side wall being articulated to an articulation portion of the other of the perimetric edge of the perimetric back wall and perimetric edge of the perimetric front wall, the flexible perimetric side wall comprising a sliding closure along a reclosable portion that extends along the edge of the flexible perimetric side wall that is articulated via the articulation portion, the sliding closure extending along said entire edge of the flexible perimetric side wall excluding the articulation portion; the suitcase is configurable between an expanded position and a collapsed position, wherein at the collapsed position the perimetric front wall accommodates the perimetric edge of the perimetric back wall and wherein the thickness of the suitcase at the collapsed position corresponds with a height of the back shell and a thickness ( t) of the front base, and the flexible perimetric side wall is folded inwards into a space extending between an inside face of the back base and an inside face of the front base at the collapsed position, and at the collapsed position the perimetric edge of the perimetric back wall substantially bears against the inside face of front base.