Item trapping blocks

When a item is dropped onto this block, the block would take it, meaning that it would pick it up like a hopper and put it into a non-accessible inventory. It could. Items in the block could not be removed in any way besides breaking the block, which would then drop all items inside of it. The block could hold up to 3 stacks of different items (just a suggestion) It would be crafted out of a soul sand block surrounded by 7 cobblestone with nothing on the 2nd slot (again, just another suggestion) To sum it up, it would take dropped items and store them away in a inaccessible inventory.