Was told long ago to keep a chalk line (the kind that holds powdered chalk inside) & a powder chalk refill in the tool box. Never had rust on tools in the box.
I bought a bag of lump camphor crystals and some plastic film cans.
Drill/punch several holes in the cans. Put a good-sized lump of camphor in the can and cap it. One can in each drawer.
I get a lot of HUGE temperature swings in my garage and therefore a lot of condensation. No rust on any of my tools as long as I keep the camphor cans replenished.