Old ammunition boxes are great for all hobby purposes like fishing, camping and so on. They are water and dust tight, cheap and durable.
I've created this box to store small parts like fishing gear, spare parts for model aircrafts, cars or any other outdoor product.
It fits nicely into an standard ammo box (cal. 300x7.62 or 840/930x5.56 or 100x.50) and it has 3 big compartments for big tools and parts and 5 drawers of different sizes for all those easy-to-lose parts. 3 of those drawers are dividable by a divider.
A latch stops the drawers from opening.

Also this box contains of over 40 parts, the assembly is quite easy. Build the basic box and then the drawers, the order should be pretty clear.

Edit: I've uploaded two images of both sheets with some comments.

Just a brief assembly instruction:

• Assemble handle with divider handle/back (The notch in the handle piece belongs into the drawer back)
• Add the bottom and the drawer bottoms (all drawer bottoms are identical)
• Add both sides to the construct
• Sort the drawers by their size/height and assemble them. All drawer bottoms (the real ones, not the in-between parts you've assembled before) are the same. 3 big ones and 2 small ones.
• stick the handles to the drawers.
• ????
• profit!