The Trash Slot mod is something just about every Minecraft player could use. Rather than dumping items on the ground where they float around doing their little rotation and the computer still needs to keep track of them, you can use this mod to simply delete unwanted items. Sure, you could still put a lava block in a nice corner somewhere and use it as a kind of garbage disposal, and if you do that already you probably don’t need this mod. But everybody else will probably be happy to have a way to get rid of unwanted entities without needing to learn complicated commands or haul lava back to their homes.
You’ll find the Trash Slot at the bottom of your inventory window, in a special layer just below. This slot can be moved around within your inventory to put it elsewhere if you wish as well. Additionally, you don’t really need to use the trash slot at all; you can press the Delete key to simply destroy whatever item your cursor is currently hovering over and that will work just fine. By holding down SHIFT while pressing Delete, you can destroy all items of the type you choose, which is good if you have an inventory full of cobblestone or dirt and just want the stuff gone.
The only thing about the Trash Slot mod is the fact it exists as a solution to a problem which shouldn’t be in the first place. See, if you have tons of resources lying around with so many building materials you could delete stacks and stacks of blocks, you’re probably spending too much time digging holes and collecting trash in the first place. If that’s the case, you might want to consider altering the way you play the game rather than finding a mod to fix it.
for Minecraft 1.8
for Minecraft 1.7.10
Credit: Blay09 – Original Thread on Curse