A silo in the form of a staircase in the mine entrance, so that you can store your cobblestones that have accumulated while mining there, for example.

Instructions:

The setup is very simple, but you need a lot of funnels, redstone lamps and comparator.
The back looks like this:

The crates are connected downwards via funnels, so that items/blocks thrown in at the top "flow" downwards. Through a few more funnels you can attach a crate to the lower end, so that you can take items from there again.
If you want to save building material, you can also use double crates, so that you need less funnel and comparator. However, it will of course take longer until the display shows more. You can also use single crates at first and switch to double crates later.