diff --git a/src/LayerPacker.php b/src/LayerPacker.php
index e74fe146..0e42d761 100644
--- a/src/LayerPacker.php
+++ b/src/LayerPacker.php
@@ -104,23 +104,26 @@ public function packLayer(ItemList &$items, PackedItemList $packedItemList, int
             if ($orientatedItem instanceof OrientatedItem) {
                 $packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
                 $layer->insert($packedItem);
-                $remainingWeightAllowed -= $itemToPack->getWeight();
                 $packedItemList->insert($packedItem);
 
                 $rowLength = max($rowLength, $packedItem->getLength());
+                $prevItem = $orientatedItem;
 
-                //Figure out if we can stack the next item vertically on top of this rather than side by side
+                //Figure out if we can stack items on top of this rather than side by side
                 //e.g. when we've packed a tall item, and have just put a shorter one next to it.
-                $this->packVerticallyInsideItemFootprint($layer, $packedItem, $packedItemList, $items, $remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z, $considerStability);
-
-                $prevItem = $orientatedItem;
+                $stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $packedItem->getDepth();
+                if ($stackableDepth > 0) {
+                    $stackedLayer = $this->packLayer($items, $packedItemList, $x, $y, $z + $packedItem->getDepth(), $x + $packedItem->getWidth(), $y + $packedItem->getLength(), $stackableDepth, $stackableDepth, $considerStability);
+                    $layer->merge($stackedLayer);
+                }
 
                 //Having now placed an item, there is space *within the same row* along the length. Pack into that.
-                if (!$this->singlePassMode && $rowLength - $orientatedItem->getLength() > 0) {
+                if ($rowLength - $orientatedItem->getLength() > 0) {
                     $layer->merge($this->packLayer($items, $packedItemList, $x, $y + $orientatedItem->getLength(), $z, $widthForLayer, $rowLength, $depthForLayer, $layer->getDepth(), $considerStability));
                 }
 
                 $x += $packedItem->getWidth();
+                $remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight() - $packedItemList->getWeight(); // remember may have packed additional items
 
                 if ($items->count() === 0 && $skippedItems) {
                     $items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
@@ -162,42 +165,6 @@ public function packLayer(ItemList &$items, PackedItemList $packedItemList, int
         return $layer;
     }
 
-    private function packVerticallyInsideItemFootprint(PackedLayer $layer, PackedItem $packedItem, PackedItemList $packedItemList, ItemList &$items, int &$remainingWeightAllowed, int $guidelineLayerDepth, int $rowLength, int $x, int $y, int $z, bool $considerStability): void
-    {
-        $stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $packedItem->getDepth();
-        $stackedZ = $z + $packedItem->getDepth();
-        $stackSkippedItems = [];
-        $stackedItem = $packedItem->toOrientatedItem();
-        while ($stackableDepth > 0 && $items->count() > 0) {
-            $itemToTryStacking = $items->extract();
-
-            //skip items that will never fit
-            if (!$this->checkNonDimensionalConstraints($itemToTryStacking, $remainingWeightAllowed, $packedItemList)) {
-                continue;
-            }
-
-            $stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $stackedItem, $items, $packedItem->getWidth(), $packedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList, $considerStability);
-            if ($stackedItem) {
-                $packedStackedItem = PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ);
-                $layer->insert($packedStackedItem);
-                $remainingWeightAllowed -= $itemToTryStacking->getWeight();
-                $packedItemList->insert($packedStackedItem);
-                $stackableDepth -= $stackedItem->getDepth();
-                $stackedZ += $stackedItem->getDepth();
-                continue;
-            }
-
-            $stackSkippedItems[] = $itemToTryStacking;
-            // abandon here if next item is the same, no point trying to keep going
-            while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
-                $stackSkippedItems[] = $items->extract();
-            }
-        }
-        if ($stackSkippedItems) {
-            $items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)), true);
-        }
-    }
-
     /**
      * As well as purely dimensional constraints, there are other constraints that need to be met
      * e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
diff --git a/tests/InfalliblePackerTest.php b/tests/InfalliblePackerTest.php
index 06750bb1..b3902c3c 100644
--- a/tests/InfalliblePackerTest.php
+++ b/tests/InfalliblePackerTest.php
@@ -453,6 +453,6 @@ public function testIssue182B(): void
         /** @var PackedBox[] $packedBoxes */
         $packedBoxes = iterator_to_array($packer->pack(), false);
 
-        self::assertCount(41, $packedBoxes);
+        self::assertCount(42, $packedBoxes);
     }
 }
diff --git a/tests/PackerTest.php b/tests/PackerTest.php
index 0243ad15..9ee4ba3f 100644
--- a/tests/PackerTest.php
+++ b/tests/PackerTest.php
@@ -557,4 +557,20 @@ public function testIssue206(): void
 
         self::assertCount(2, $packedBoxes);
     }
+
+    public function testIssue231(): void
+    {
+        $packer = new Packer();
+        $packer->setMaxBoxesToBalanceWeight(0);
+        $packer->addBox(new TestBox('Box 2.5-1', 30, 20, 20, 2, 30, 20, 20, 1000));
+
+        $packer->addItem(new TestItem('Item 1', 20, 20, 2, 0, false), 4);
+        $packer->addItem(new TestItem('Item 2', 8, 3, 2, 0, false), 5);
+        $packer->addItem(new TestItem('Item 3', 10, 10, 10, 0, false), 4);
+        $packer->addItem(new TestItem('Item 4', 12, 12, 10, 0, false), 2);
+        $packer->addItem(new TestItem('Item 5', 6, 4, 2, 0, false), 2);
+        $packedBoxes = $packer->pack();
+
+        self::assertCount(1, $packedBoxes);
+    }
 }
diff --git a/tests/data/expected.csv b/tests/data/expected.csv
index c20d75bc..8aa84338 100644
--- a/tests/data/expected.csv
+++ b/tests/data/expected.csv
@@ -393,7 +393,7 @@
 1672e9897bfb16f7f644365da8d6992c,1,0,26.4,1,0,26.4
 167db38fa514a30e70f167f70d19f214,1,0,16.2,1,0,16.2
 168065302d10d2f4b683e3d5e7475594,2,180200.3,32.7,1,0,19.8
-1680b70ba864c313d28c9386ce54ac25,3,11023938.7,44,3,8617.6,38.5
+1680b70ba864c313d28c9386ce54ac25,3,11023938.7,44,3,6590.9,38.5
 1694662b95ac32661ee2b45826bb54f6,1,0,42.4,1,0,42.4
 16a2283358cddda00bf2e47e5ad746d3,1,0,24,1,0,24
 16a59c72d05be053c19e4b32ceafaef0,1,0,29.2,1,0,29.2
@@ -1039,7 +1039,7 @@
 3bdea76452dfd0a2dd349e05688ceea7,1,0,36.2,1,0,36.2
 3bec6daa3c92aab45d0db63b688bad9e,5,89240,34.3,2,3543806.3,18.1
 3becb246809835f192b15039849f3528,1,0,27.5,1,0,27.5
-3bee0a82a9098c92945daac991fca070,2,12.3,23.7,1,0,7.1
+3bee0a82a9098c92945daac991fca070,2,812.3,23.7,1,0,7.1
 3c1b74fc52f870503d59c3327da6d203,2,607620.3,40,1,0,24.2
 3c29ccbdb900b4ade8f05884d9bafb1c,1,0,38.1,1,0,38.1
 3c2bc39429c8d1a0db6369149f454d65,2,2916,39.5,1,0,11.9
@@ -1379,7 +1379,7 @@
 4fb44d17cda18d0c04605f4374ffdb1a,2,35344,31.3,1,0,9.4
 4fc2ca67d296a3e0d82f8b854923d168,1,0,15.9,1,0,15.9
 4fcd699375dfa7df1c0eb12192d63b7c,3,51416.2,39.8,1,0,17.9
-4fd15118c3e987fccfbad711528ff651,2,20306.3,33.2,1,0,20.1
+4fd15118c3e987fccfbad711528ff651,2,137270.3,33.2,1,0,20.1
 4fe79c3227acbda1fe01333d510f123d,1,0,18.8,1,0,18.8
 500766fa9c90269017ac1194fa6c1e0e,1,0,22.9,1,0,22.9
 500db53f251bd71c4d30a298b982f6ac,1,0,45.5,1,0,45.5
@@ -1890,7 +1890,7 @@
 6d0c88f8167434fcab5a7b9f330f0885,2,0,42.6,2,0,42.6
 6d111f1a879a3c039d73657ccfe74005,1,0,31,1,0,31
 6d1ebe448310ccf0f310b0236a9992d5,1,0,40.4,1,0,40.4
-6d30ec00cea682d3aadfab28a2665e39,1,0,44.8,1,0,44.8
+6d30ec00cea682d3aadfab28a2665e39,2,2500,22.4,1,0,6.7
 6d31a51a06785af8acc76099922e6c77,1,0,33.1,1,0,33.1
 6d3a1f35383f5a21e69f0477bfe8ba3b,2,11923209,66.7,2,11923209,66.7
 6d3ac65f88396d25753aafd4abbf6b0c,1,0,28.5,1,0,28.5
@@ -2811,7 +2811,7 @@ a4e8c2d7bb8e21c07d5d5bae9a48e4d6,1,0,50.3,1,0,50.3
 a4fd5a590aaa3f655ba15495467d6f70,1,0,18.6,1,0,18.6
 a4ff6a3aaf181e8d271f83f5f54c08f0,1,0,22.4,1,0,22.4
 a519050b60f3a28945c3af20e54c98e5,1,0,34.1,1,0,34.1
-a52ed384032d0d764c40c5b198b0cfe1,1,0,60.9,1,0,60.9
+a52ed384032d0d764c40c5b198b0cfe1,2,506.3,30.4,1,0,9.1
 a5328f72f09fcc8322081db3107d25de,1,0,40.1,1,0,40.1
 a534bd597a5e786f47acade9b5189bb0,2,2352.3,29.4,1,0,17.8
 a536b666854eead81fb1bf325fedcf9a,1,0,42.1,1,0,42.1
@@ -2826,7 +2826,7 @@ a5d6c152df8c6966ed3b39588106079f,1,0,17.2,1,0,17.2
 a5ec92541060f2793041970dd5de10c3,1,0,16.2,1,0,16.2
 a5efd1b0c6ca442b1c7a59bf00938d3e,1,0,46.9,1,0,46.9
 a60d82e7aaff19e99d10de4cc5444356,1,0,27.5,1,0,27.5
-a6301dc72697cfd7e96312f0b33f51ac,2,3152400.3,51,1,0,30.9
+a6301dc72697cfd7e96312f0b33f51ac,2,3106406.3,51,1,0,30.9
 a631d607f7a57e526b5c1fe63bab1a62,1,0,20.6,1,0,20.6
 a632234c51a55c0ff877973a0198fcba,2,462.3,34.9,1,0,10.5
 a6354eea25581f1805f09ffcd40eabe8,1,0,18.1,1,0,18.1
@@ -3736,7 +3736,7 @@ dc9737ca1f92510793b36d8ae7cb5e3d,1,0,15.8,1,0,15.8
 dcaca1dd153991ec35057c6d4fee3486,1,0,44.6,1,0,44.6
 dcc277e172757d58122d2ccb930f8c4b,1,0,43.9,1,0,43.9
 dcf2491716b475d4ecbd6cc3982a415e,2,1156,31.8,1,0,9.5
-dcf5b5a83a9848963949ab6a6ba6abd7,4,4363573.3,46.4,2,23104,38.6
+dcf5b5a83a9848963949ab6a6ba6abd7,4,4363573.3,46.4,2,1156,38.6
 dd0a4b2010a740c448bd83907d2980ea,1,0,28.5,1,0,28.5
 dd0b36c45e6dd7c0bbca1132041a2bc8,1,0,36.1,1,0,36.1
 dd10cf63e03f3226d61c074d9d8e1caf,1,0,20.3,1,0,20.3
@@ -3746,7 +3746,7 @@ dd655a5bf318ca48d36010fce2709553,1,0,22.3,1,0,22.3
 dd74f550bb177a933b62b5d2836fa4ac,1,0,47.6,1,0,47.6
 dd8191420604dcedf2ec59a470b09b4b,2,6642.3,30.5,1,0,9.1
 dd897cf7eea6d6a7cc0380f78f29ba4f,1,0,35.5,1,0,35.5
-dd9218a4b66b8a0378dc16a8fba27f67,2,12089529,45.5,2,27556,35.9
+dd9218a4b66b8a0378dc16a8fba27f67,2,12089529,45.5,2,25,35.9
 dd9fb38020ae211a57e53460275d0669,1,0,26.4,1,0,26.4
 ddaa30c4e2af2de865dda0e017d98665,2,110.3,49.9,1,0,15
 ddd908a2c90918db7e76f544b2a35883,1,0,44,1,0,44
@@ -4199,7 +4199,7 @@ fa5d9ae6b63e9d33769081f7d4f2b115,1,0,30,1,0,30
 fa74eadd074843a8c78542d7602c31d4,1,0,48.4,1,0,48.4
 faa914e796a804997c19804300db0204,1,0,42.7,1,0,42.7
 faae756f0de0eef0384474255db1e662,1,0,41.6,1,0,41.6
-fac6c548649f983888821cb370e87966,1,0,34,1,0,34
+fac6c548649f983888821cb370e87966,1,0,74.5,1,0,34
 fad39d2e603bae2ac15387a3662de7ff,2,22201,37.6,1,0,11.3
 fae22f77df7666ed2fdc5757bd78ed07,1,0,33.9,1,0,33.9
 faec3db769a11d268cd4845fb3966167,1,0,41.1,1,0,41.1
diff --git a/tests/data/thpack-expected.csv b/tests/data/thpack-expected.csv
index 9d33a3a2..9fa8e35f 100644
--- a/tests/data/thpack-expected.csv
+++ b/tests/data/thpack-expected.csv
@@ -26,7 +26,7 @@ Bischoff #3-10,69.7
 Bischoff #3-11,71
 Bischoff #3-12,79.8
 Bischoff #3-13,89.9
-Bischoff #3-14,81
+Bischoff #3-14,81.3
 Bischoff #3-15,71.5
 Bischoff #3-16,84.1
 Bischoff #3-17,87.4
@@ -114,9 +114,9 @@ Bischoff #3-98,81.3
 Bischoff #3-99,78
 Bischoff #3-100,62.9
 Bischoff #5-1,72.9
-Bischoff #5-2,83.8
+Bischoff #5-2,84.3
 Bischoff #5-3,71.5
-Bischoff #5-4,65.9
+Bischoff #5-4,73.9
 Bischoff #5-5,83.5
 Bischoff #5-6,80.4
 Bischoff #5-7,75.8
@@ -148,7 +148,7 @@ Bischoff #5-32,81.8
 Bischoff #5-33,82.7
 Bischoff #5-34,75.8
 Bischoff #5-35,84.6
-Bischoff #5-36,73.2
+Bischoff #5-36,74.9
 Bischoff #5-37,79.5
 Bischoff #5-38,75.6
 Bischoff #5-39,82.7
@@ -165,7 +165,7 @@ Bischoff #5-49,85.9
 Bischoff #5-50,74.2
 Bischoff #5-51,89.3
 Bischoff #5-52,87.1
-Bischoff #5-53,71.3
+Bischoff #5-53,72.3
 Bischoff #5-54,71.2
 Bischoff #5-55,70.3
 Bischoff #5-56,83.3
@@ -208,15 +208,15 @@ Bischoff #5-92,74.6
 Bischoff #5-93,84.9
 Bischoff #5-94,73.7
 Bischoff #5-95,85.2
-Bischoff #5-96,83
-Bischoff #5-97,83.3
+Bischoff #5-96,83.2
+Bischoff #5-97,84.1
 Bischoff #5-98,82.5
 Bischoff #5-99,76.4
 Bischoff #5-100,66.6
 Bischoff #8-1,70.7
-Bischoff #8-2,84.9
+Bischoff #8-2,85.3
 Bischoff #8-3,74.1
-Bischoff #8-4,61.4
+Bischoff #8-4,65
 Bischoff #8-5,76.7
 Bischoff #8-6,82.7
 Bischoff #8-7,67.1
@@ -229,7 +229,7 @@ Bischoff #8-13,79.4
 Bischoff #8-14,80.3
 Bischoff #8-15,82.7
 Bischoff #8-16,84.6
-Bischoff #8-17,75.6
+Bischoff #8-17,75.9
 Bischoff #8-18,80.5
 Bischoff #8-19,88.1
 Bischoff #8-20,77.8
@@ -239,7 +239,7 @@ Bischoff #8-23,83.8
 Bischoff #8-24,77.9
 Bischoff #8-25,82.1
 Bischoff #8-26,88.3
-Bischoff #8-27,77.1
+Bischoff #8-27,77.2
 Bischoff #8-28,77.9
 Bischoff #8-29,70.1
 Bischoff #8-30,73.5
@@ -248,7 +248,7 @@ Bischoff #8-32,77.9
 Bischoff #8-33,83.9
 Bischoff #8-34,72
 Bischoff #8-35,75.1
-Bischoff #8-36,74.9
+Bischoff #8-36,75
 Bischoff #8-37,81.8
 Bischoff #8-38,72.4
 Bischoff #8-39,84
@@ -261,7 +261,7 @@ Bischoff #8-45,81.2
 Bischoff #8-46,67.8
 Bischoff #8-47,67.1
 Bischoff #8-48,81.9
-Bischoff #8-49,73.8
+Bischoff #8-49,74.6
 Bischoff #8-50,79.3
 Bischoff #8-51,85.4
 Bischoff #8-52,91.8
@@ -274,14 +274,14 @@ Bischoff #8-58,84.8
 Bischoff #8-59,77.5
 Bischoff #8-60,76.9
 Bischoff #8-61,73.8
-Bischoff #8-62,81.5
-Bischoff #8-63,85.3
+Bischoff #8-62,82.8
+Bischoff #8-63,85.5
 Bischoff #8-64,73.1
 Bischoff #8-65,86.8
 Bischoff #8-66,82.5
 Bischoff #8-67,71.9
 Bischoff #8-68,82.6
-Bischoff #8-69,73.1
+Bischoff #8-69,73.7
 Bischoff #8-70,71.6
 Bischoff #8-71,72.6
 Bischoff #8-72,74
@@ -298,8 +298,8 @@ Bischoff #8-82,80.1
 Bischoff #8-83,80.1
 Bischoff #8-84,75.6
 Bischoff #8-85,83.5
-Bischoff #8-86,83.9
-Bischoff #8-87,79
+Bischoff #8-86,84.2
+Bischoff #8-87,79.2
 Bischoff #8-88,69
 Bischoff #8-89,66.4
 Bischoff #8-90,83.8
@@ -308,15 +308,15 @@ Bischoff #8-92,76.6
 Bischoff #8-93,67
 Bischoff #8-94,80.1
 Bischoff #8-95,74.1
-Bischoff #8-96,75.6
-Bischoff #8-97,82.2
+Bischoff #8-96,76.3
+Bischoff #8-97,82.9
 Bischoff #8-98,69.9
 Bischoff #8-99,83.6
-Bischoff #8-100,76.9
+Bischoff #8-100,77.4
 Bischoff #10-1,73.6
-Bischoff #10-2,86.2
+Bischoff #10-2,86.5
 Bischoff #10-3,77.9
-Bischoff #10-4,68.8
+Bischoff #10-4,73
 Bischoff #10-5,78.9
 Bischoff #10-6,81.5
 Bischoff #10-7,69.7
@@ -335,20 +335,20 @@ Bischoff #10-19,81
 Bischoff #10-20,75.7
 Bischoff #10-21,72.7
 Bischoff #10-22,76.9
-Bischoff #10-23,84.4
+Bischoff #10-23,86.2
 Bischoff #10-24,72.7
 Bischoff #10-25,75.2
-Bischoff #10-26,79
-Bischoff #10-27,74.8
+Bischoff #10-26,79.7
+Bischoff #10-27,75.8
 Bischoff #10-28,75.2
 Bischoff #10-29,68.5
 Bischoff #10-30,77.5
 Bischoff #10-31,65.4
 Bischoff #10-32,73.9
-Bischoff #10-33,84
+Bischoff #10-33,84.1
 Bischoff #10-34,76.3
-Bischoff #10-35,74.3
-Bischoff #10-36,65.1
+Bischoff #10-35,74.5
+Bischoff #10-36,66.3
 Bischoff #10-37,83.1
 Bischoff #10-38,70.5
 Bischoff #10-39,70.7
@@ -357,122 +357,122 @@ Bischoff #10-41,79
 Bischoff #10-42,79.3
 Bischoff #10-43,76
 Bischoff #10-44,71.8
-Bischoff #10-45,77.6
+Bischoff #10-45,77.8
 Bischoff #10-46,80.3
 Bischoff #10-47,69.8
 Bischoff #10-48,86.7
 Bischoff #10-49,71.9
-Bischoff #10-50,74.1
-Bischoff #10-51,71.3
+Bischoff #10-50,74.4
+Bischoff #10-51,71.6
 Bischoff #10-52,80.6
 Bischoff #10-53,79.1
 Bischoff #10-54,77.1
-Bischoff #10-55,67.1
+Bischoff #10-55,67.5
 Bischoff #10-56,78.4
 Bischoff #10-57,80.9
 Bischoff #10-58,77.1
 Bischoff #10-59,78.2
-Bischoff #10-60,74.7
+Bischoff #10-60,75.2
 Bischoff #10-61,78.9
-Bischoff #10-62,85.7
+Bischoff #10-62,86.3
 Bischoff #10-63,71
 Bischoff #10-64,74.9
 Bischoff #10-65,82.4
 Bischoff #10-66,74.7
 Bischoff #10-67,76.3
-Bischoff #10-68,70.1
+Bischoff #10-68,71.4
 Bischoff #10-69,77
-Bischoff #10-70,74.3
+Bischoff #10-70,75.3
 Bischoff #10-71,83.4
 Bischoff #10-72,72.5
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