1 files changed, 21 insertions, 0 deletions
diff --git a/azalea-inventory/src/item/mod.rs b/azalea-inventory/src/item/mod.rs
new file mode 100644
index 00000000..07e51363
--- /dev/null
+++ b/azalea-inventory/src/item/mod.rs
@@ -0,0 +1,21 @@
+pub trait MaxStackSizeExt {
+    /// Get the maximum stack size for this item.
+    ///
+    /// This is a signed integer to be consistent with the `count` field of
+    /// [`ItemSlotData`].
+    fn max_stack_size(&self) -> i8;
+
+    /// Whether this item can be stacked with other items.
+    ///
+    /// This is equivalent to `self.max_stack_size() > 1`.
+    fn stackable(&self) -> bool {
+        self.max_stack_size() > 1
+    }
+}
+
+impl MaxStackSizeExt for azalea_registry::Item {
+    fn max_stack_size(&self) -> i8 {
+        // TODO: have the properties for every item defined somewhere
+        64
+    }
+}