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+# Containers
+
+Containers contain entities. Whether for inventory, backpacks, solutions, or actions. Containers contain lists of entities for usage in systems.
+
+## Review
+
+Any code that subscribes to container events should have a guard clause that checks for only the relevant containers.
+
+```cs
+private void OnContainerModified(EntityUid uid, MicrowaveComponent component, ContainerModifiedMessage args)
+{
+    if (component.Storage != args.Container)
+        return;
+
+    // Code continues ...
+}
+```
+
+There have been problems in the past with [updating UI on unrelated containers (#27500)](https://github.com/space-wizards/space-station-14/pull/27500)
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