What a good container to buy to store spicy pillows?[im replacing old handheld batteries need a explosion proof container] under 50 usd

So yeah got a switch and two dsi xl from childhood need new batteries and need a container to store them because well I they old asf 7 plus switch the unpatxhed version version never changed battery and dsi xl shii idk older but both dont have bending and shii so probably not inflated or crazy amount but want to makw sure where I store them can control spontaneous combustion flame shii etc

Under 50 usd