Amazon Basics Foldable Burlap Cloth Cube Storage Bins with Lid, Collapsible Organizing Containers, Stackable and Sturdy, Gray, Set of 2

I found these, which are 16.25 x 13 x 12.13. There would be an inch or so hanging off the front and back. https://www.amazon.com/HOMZ-Large-Plastic-Storage-Latching/dp/B071CWD2T5 Or I found these, which have lids, but they don't latch. https://www.amazon.com/Amazon-Basics-Collapsible-Organizing-Containers/dp/B07JJF6G9Q Honestly, if your goal is to encourage one box at a time, this might be a psychology issue rather than an organizational issue. Like, personifying toys that are sad when they're strewn across the floor and left there might work. Heck, personifying objects works on adults too. Or painting a house on the front of each storage bin, and saying they toys all need to go home to rest.