When most people use milk crates for storage, they just dump stuff into it. At most, they flip it over, so they can use the side of the crate as additional space for stacking stuff.
What you need
* Milk crates (Dumpster Diving is the best way to get these)
* Zip tie / Cable tie
How to do it
* Stack the milk crates ontop of or/and beside each other
* Connect them securely with zip / cable tie
* Make or find more stuff to fill up your milk crate cabinet!
– UPcycling Phoenix