What's the ground item limit?

[TheDerpKing666]

Title says it all

 

[Darkninja27]

I tested It and could drop about 2 double chest and 36 slots of the third double chest on the ground until the warning popped up.
1 Double chest = 54 slots
2 Double chest * 54 = 108 slots
108 slots + 36 slots of the third double chest = 144 slots
144 slots all got 64 Item's = 9.216
but I have got some farm's running in the background so about 9.3K items.