Abstract: An expandable insert for soft luggage articles, such as backpacks includes a pair of opposing planar insert panels interconnected by two web members. The web members may either be partially integrally formed from the insert panels or they may be separately formed. The web members are themselves also planar and each includes a foldline disposed therein between the opposing insert panels. At least one elastic band engages the two web members and provides an expansion force for the insert which draws the web members from a folded position into a generally planar position wherein they are generally perpendicular to the insert panels. The web members may include gusset portions which interconnect the web members to the insert panels.