Thanks to a couple of hurricanes, I had quite a bit of scrap cedar fencing when my fence blew down along with a good many others in town. I decided to replace it with a metal fence (wrought iron style), so I had a lot of cedar pickets that still had a bit of life in them. I pressure washed some of them and let them dry out and used them for storage boxes in my garage for nails & bolts and in my reloading room for brass and bullets. The ones for brass can be quite a bit longer than the ones for bullets. Here's a couple of photos of the small ones being used for bullets and brass. These are made from 5 pieces of the cedar picket and they are all the same length (about 7" long). The pickets are about 5.5" wide. By making all the pieces the same length, I can set up my power miter saw with a stop block and cut them all out very quickly.
So, by recycling the old pickets, the cost of the boxes were a few nails, a bit of glue, and a minute or two with my small electric pressure washer (I don't break out the gas powered one unless I've got a large project).
New pickets are around $2.40 each at Home Depot. They are 5/8" thick -- a bit thicker than my pickets were after all these years and numerous pressure washings. You can make 2 boxes out of a single new picket.
The joints are just glued and nailed, no fancy joinery, but they hold up nicely. The above box that is partly filled with bullets weighed 38 lbs. I could see that hitting 50 lbs if it was filled all the way to the top. As far as I'm concerned, the size of the box is limited by how much I'm willing to carry from the storage area to my reloading bench at one time.