Abstract: A backpack having a longitudinal axis and a perpendicular transverse axis includes a top end, a bottom end, and a body portion extending between the top end and the bottom end. The backpack also includes an expansion panel attached to each of the top end, the bottom end, and the body portion. The expansion panel is longitudinally-oriented and is configured to expand in a transverse direction between a collapsed configuration and an expanded configuration.

Abstract: A portable structure configured for erection with first and second front struts. The structure has a shell with front and rear edges. The shell has first and second strut couplers positioned adjacent the front edge that are configured to be coupled to first and second front struts, respectively. The shell has first and second tension members extending in a longitudinal direction away from the front and rear edges, respectively, when the shell is in an erect position. The first and second tension members are configured to be coupled to a ground surface or an external structure to tension the shell in the longitudinal direction when the shell is in the erect position. A rear strut is coupled to the shell when the shell is in the erect position. The portable structure is preferably a tent. The front struts may be provided separately from the tent.