A container having walls and defining a space between the walls in which articles may be contained. The container includes a partition and attachment. The attachment is operable, in use, to adjustably attach the partition to the container within the space, to form a smaller space of variable size. The attachment includes complementary formations on the container and on the partition, which mate so attach the partition to the container. There is sufficient resilience in or associated with the complementary formations to allow the partition to be adjusted along an adjustment direction by the application of sufficient force in that direction fo force the complementary formations tp disengage.