diff --git a/CHANGELOG.md b/CHANGELOG.md
index 186a0727..20c42977 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 
-## [3.x - Unreleased] - 2020-xx-xx
+## [3.x - Unreleased] - 2021-xx-xx
+
+## [3.7.0] - 2021-01-01
+### Added
+- Added `getVolume` helper method to `PackedItemList`
 
 ## [3.6.2] - 2020-09-28
 ### Added
@@ -441,8 +445,9 @@ Initial release
  - Experimental code to get a feel for how calculations can best be implemented
  - Only works if all items fit into a single box (so not production ready at all)
 
-[3.x - Unreleased]: https://github.com/dvdoug/BoxPacker/compare/3.6.2...3.x
+[3.x - Unreleased]: https://github.com/dvdoug/BoxPacker/compare/3.7.0...3.x
 
+[3.7.0]: https://github.com/dvdoug/BoxPacker/compare/3.6.2...3.7.0
 [3.6.2]: https://github.com/dvdoug/BoxPacker/compare/3.6.1...3.6.2
 [3.6.1]: https://github.com/dvdoug/BoxPacker/compare/3.6.0...3.6.1
 [3.6.0]: https://github.com/dvdoug/BoxPacker/compare/3.5.2...3.6.0
diff --git a/src/PackedBox.php b/src/PackedBox.php
index bc6c1303..eda6fac2 100644
--- a/src/PackedBox.php
+++ b/src/PackedBox.php
@@ -179,14 +179,7 @@ public function getInnerVolume(): int
      */
     public function getUsedVolume(): int
     {
-        $volume = 0;
-
-        /** @var PackedItem $item */
-        foreach ($this->items as $item) {
-            $volume += $item->getVolume();
-        }
-
-        return $volume;
+        return $this->items->getVolume();
     }
 
     /**
diff --git a/src/PackedItemList.php b/src/PackedItemList.php
index 537fc695..76c8dd8d 100644
--- a/src/PackedItemList.php
+++ b/src/PackedItemList.php
@@ -77,6 +77,20 @@ public function asItemArray(): array
         }, $this->list);
     }
 
+    /**
+     * Get total volume of these items.
+     */
+    public function getVolume(): int
+    {
+        $volume = 0;
+
+        foreach ($this->list as $item) {
+            $volume += $item->getVolume();
+        }
+
+        return $volume;
+    }
+
     private function compare(PackedItem $itemA, PackedItem $itemB): int
     {
         $itemAVolume = $itemA->getItem()->getWidth() * $itemA->getItem()->getLength() * $itemA->getItem()->getDepth();