This is a 2 tier crate. I saw this on-line somewhere I will attempt to explain how it's done. (If you know who thought of this let me know I will give them credit)
First you will need to rescue 3 milk crates.
You will need to cut the bottom off flush from one milk crate, this will be the top lid. The second you will also need to cut off about 4 inches up. This piece will be the top storage area.(If you look at the black part of my crate you will see what I mean.) All pieces should fit together, provided all your milk crates are the same size.
Small easy access area created with the bottom part of a milk crate.
Storage area lifted to access large storage area.
I drilled holes and used zip-ties for the hinges.
I use bungee cord and hooks to keep the lids secure so everything doesn't dump when I lift the top to access the large storage areas.
If you have any questions let me know.