I designed a divider for my Rotho 16 liter “BRISEN” storage bins, to help keep items like brushes, rulers, and similar objects upright.

The design uses the tabs at the base of the basket to hook onto the walls, without the need for any additional fasteners.

It fits perfectly around the curved parts and non-orthogonal walls of the box.

I've uploaded the versions with 1 , 2 and 3 compartments