Blanks for divided containers

A blank of sheet material 10 for forming a container having a divider comprises first portions 12 for forming a floor, at least one second portion 18,20 foldable along a respective fold line to form at least one peripheral wall of the container and a third portion 22 foldable along at least one further fold line 28 to form a divider. The divider extends into a space defined by the at least one peripheral wall and the container floor so as to divide the space into two separate areas. The at least one second portion 18,20 and the third portion 22 are configured with apertures 50, 48 such that, when they are both folded, they form respective interlocking profiles which cooperate to hold the divider in position to resist collapse of the divider.