Minecraft wiki entry for Beginner%27s_guide, associated text: Multiple items of the same type usually "stack", showing a number indicating how many of them there are. Most items stack up to 64; other items (like chicken eggs) stack only to 16. Weapons, tools and armor are more individual, and do not stack at all. When you use, place, or throw items from a stack, you generally use one item at a time, counting down the stack.