A blank for constructing a box file, card index box, or the like which, in the made up form comprises a pair of similar half shells hinged together along a common edge, the blank including a pair of base members (2, 2a) each having outwardly extending side portions (4, 6, 16; 4a, 6a, 16a) on at least three sides which can be bent up to form side walls, with each side portion (4, 6; 4a, 6a) being joined to the adjacent side portion (16, 16a) by an inwardly foldable connection section (18, 20; 18a, 20a) which is adapted to form a right angled corner when the blank is folded into shape. An interconnecting or stacking system for file storing boxes is also provided which comprises a body (56; 58) having a slot or aperture (90; 102) and adapted to be mounted on the wall of the box and a generally 'U-section' clip member (104), having a pair of legs (106) each of which is adapted to fit in one of the said slots (90; 102), whereby when two such connector members are suitably positioned in the adjacent walls of two corresponding boxes, they may be clipped together by inserting the legs of the clip member into the adjacent slots.
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