These have a conventional slot-and-tab construction but the front has flexible portions that let it curve into the sides; it's glued to the bottom to enforce the desired radius. I designed everything in Solidworks and the parts have some parameters that are driven by a text file, which made it easy to output it in three different heights: 2 inch, 3 inch, and 5 inch. Mine are made out of 1/8 inch birch plywood but the thickness is parameterized as well.

Here are the 3D design files as well as a 2D PDF containing all parts necessary to make two each of the three heights, laid out onto four sheets of 12 inch by 12 inch plywood:

• Side Storage Bins, Solidworks
• Side Storage Bins, 2D PDF