These are regular ammo cans that measure 6" wide x 13" tall x 11" long- like a 50cal can but taller. They were used as storage cans for nigh vision monoculars so they have foam padding inside.
You can use them either for storing electronics or other sensitive items inside so you get a waterproof, metal sealed case for a great price or you can remove the padding and have a nice sized ammo can.
We are offering with these the option to ship it with a 30cal ammo can inside it- shipping a smaller can inside a newer can is an old surplus dealers trick that lets you cut shipping costs by having more stuff in the same size package. Adding the cal can you will pay for the cost of shipping the can only, no increase in shipping cost.