I fit four of these in my garage shelving and the inside is roomier than the outside dimensions suggest — 20 by 13.75 inches holds way more than I expected. The lids lock down solid, so I don't worry about them popping open when I stack them.
The locking lids actually snap shut tight, which matters since I'm storing power tools in the garage. Interior is roomy enough for a circular saw plus cords, and the 9 inch height fits under my workbench shelf.
Bought these to finally organize my craft room and the 8.75" interior height fits my sewing supplies way better than the shallow bins I had before. The locking lids actually snap down tight, so nothing spills when I stack them. Made in the USA too, which sealed it for me.