Anything that comes in a stout wood box (think US GI ammo crate). Then screw the lid together in many places, countersinked, and use wood filler in the holes.

Before you screw it, be sure to use wood glue and cabinet clamps. Then write on it "caution, contents will not survive cutting or stabbing". The smaller the box, the better. That's all you have to do.

Even if you have tools, this sounds like a shitty day to me.