Abstract: A reusable foldable blank comprising a substantially flat sheet having a plurality of hinge lines (18) to define a plurality of panels, said panels being foldable in use along the hinge lines to define a box structure, said box structure at least comprising: a bottom panel (2), at least first (3), second (4) and third (7) side wall panels extending from the bottom panel, and one or more first releasable securing means (14) for releasably securing at least two of the folded side wall panels together. The blank is particularly suitable for books.