Shelf insert compatible with Kallax as a door and back panel in various colours, compatible with Expedit cube shelf (33 x 33 cm), easy to assemble without tools (gold, white handle) :
Flexi Storage Clever Cube 334 x 334 x 385mm White Matte H Shelf Insert - Bunnings Australia
KALLAX Shelf unit with 4 inserts, white, 77x147 cm (303/8x577/8") - IKEA CA
Pin on Hacks
IKEA KALLAX shelf insert: Easily divide the cube with these hacks