Item Buffer - Industrial-Craft-Wiki- buffer hopper for first mill cable ,The Item Buffer is a combination of a Hopper and a Chest, two times, in one block. It works well together with the Electric Sorting Machine.. RecipeHopper - Book flights & hotels on your phoneSave up to 40% on your next flight. Hopper analyzes billions of prices daily to predict how prices will change, and tells you whether to buy or wait.