The Crate. Good for builders and redstoners

A block looking like a wooden version of chiseled copper. with 10 storage spaces, but when you put several next to each other and open one, the spaces add up. 10 crates side by side would have a total storage space of 100, which you access by clicking just one of them. 

It is instant, so no matter how long the chain of crates is, if you put an item in one, the other receive the item in its storage (shared storage), so instant redstone signal readable by comparator or observer.

crafting recipe:

(Ø=nothing)

Ø     Ø    Ø

Ø chest  Ø

Ø hopper Ø

Copper golems can pass through them like tunnels, so if you have a long string of crates connecting two rooms, copper golems can pass through like a tunnel shortcut.

Also: quartz crates. Each crate has another 3 squares that are seperate (so total 13 storage spaces). These spaces are also shared just like the others. But if there is a quartz chest in the string of crates, then something special happens when the quartz crate is powered by redstone. Those spaces become locked and disappear from the other crates, but are still and only in the quartz crates. If you want to retrieve your items in the quartz crate without unpowering the redstone, you can click on your copper golem with quartz, he will understand and climb into the tunnel,a nd when he comes back he will have the three items from the locked spaces. He will only do this for the person that created him.

Quartz crates crafting recipe:
Ø      quartz       Ø

Ø      crate         Ø

Ø redstone dust Ø