A container , i. the container having a container collapsed condition and a container expanded condition, ii. the container having a bottom structure and a top structure and a plurality of walls (13-16) connected to the bottom structure and to the top structure , iii. the container being generally flat in the container collapsed condition, and in the container expanded condition the top structure being spaced from the bottom structure a greater distance than in the container collapsed condition, iv. a first of the plurality of walls comprising first and second sections that connect together at a fold line about which the first and second sections are rotatable between first wall collapsed and expanded conditions, the first section being connected to the bottom structure and the second section being connected to the top structure , and expansion of the first wall from the first wall collapsed condition to the first wall expanded condition causes the top structure to shift away from the bottom structure , characterised by v. the first wall being expandable by rotation of the first section relative to the second section in a first direction of rotation about the fold line from the first wall collapsed condition and into engagement with an abutment of the container at the first wall expanded condition, whereby engagement of the first wall with the abutment arrests further rotation of the first section relative to the second section about the fold line in the first direction of rotation, the first wall being maintained in the first wall expanded condition by a load applied to the first wall by the top and bottom structures that resists rotation of the first section relative to the second section in a second direction of rotation opposite to the first direction of rotation. i. the container having a container collapsed condition and a container expanded condition, ii. the container having a bottom structure and a top structure and a plurality of walls (13-16) connected to the bottom structure and to the top structure , iii. the container being generally flat in the container collapsed condition, and in the container expanded condition the top structure being spaced from the bottom structure a greater distance than in the container collapsed condition, iv. a first of the plurality of walls comprising first and second sections that connect together at a fold line about which the first and second sections are rotatable between first wall collapsed and expanded conditions, the first section being connected to the bottom structure and the second section being connected to the top structure , and expansion of the first wall from the first wall collapsed condition to the first wall expanded condition causes the top structure to shift away from the bottom structure , characterised by v. the first wall being expandable by rotation of the first section relative to the second section in a first direction of rotation about the fold line from the first wall collapsed condition and into engagement with an abutment of the container at the first wall expanded condition, whereby engagement of the first wall with the abutment arrests further rotation of the first section relative to the second section about the fold line in the first direction of rotation, the first wall being maintained in the first wall expanded condition by a load applied to the first wall by the top and bottom structures that resists rotation of the first section relative to the second section in a second direction of rotation opposite to the first direction of rotation. <EOS>