Ma'lak Boxes

A Ma'lak Box is a coffin designed to keep any creature locked inside, specifically an Archangel, as stated by Dean.

Overview
A Ma'lak Box is a coffin that's warded to keep any creature trapped inside. Especially Archangels, as stated by Dean Winchester in Damaged Goods.

Though the box doesn't look necessarily sturdy, it's strong enough to keep even an Archangel locked inside for eternity.

Dean Winchester plans to lock himself (and thereby Alternate Michael) inside of the Ma'lak Box, and have it thrown into the Pacific Ocean to prevent Alternate Michael from breaking free, as stated in Damaged Goods.

Physical Appearence
The Ma'lak Box shown in Damaged Goods is made of sheet metal and metal bars. The edges are welded together by Dean Winchester. There are also multiple sigils welded onto the outside of the box.

Appearances

 * Season 14
 * Damaged Goods

Trivia

 * Ma'lak Boxes are supposedly extremely difficult to manufacture. In Damaged Goods, Sam Winchester even stated that they're impossible to build, though Dean had already successfully built one at this point.
 * Sam also stated that nobody has ever built a Ma'lak Box before. This makes Dean the first person ever to do so.