Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5360439.

UPDATE: Added an easier print version added in response to a fellow members printing issues. The Easy Print version has a straight 45 deg corner bevel in the handle cutouts as opposed to a radius.

Simple stackable storage box in the style of a beer crate with a closed bottom. Don't forget you can scale this up or down in your slicer software to suit you needs