diff --git a/src/add_packing_list.php b/src/add_packing_list.php
index 773827e..05c3085 100644
--- a/src/add_packing_list.php
+++ b/src/add_packing_list.php
@@ -161,7 +161,7 @@ require_once 'header.php';
                                 <div class="mb-3 pb-3 border-bottom">
                                     <div class="form-check mb-2">
                                         <input class="form-check-input" type="checkbox" name="participate[<?php echo $user['id']; ?>]" value="1" checked id="part_<?php echo $user['id']; ?>">
-                                        <label class="form-check-label fw-bold" for="part_<?php echo $user['id']; ">
+                                        <label class="form-check-label fw-bold" for="part_<?php echo $user['id']; ?>">
                                             <?php echo htmlspecialchars($user['username']); ?>
                                         </label>
                                     </div>
diff --git a/src/packing_list_detail.php b/src/packing_list_detail.php
index 1b44930..8bb9270 100644
--- a/src/packing_list_detail.php
+++ b/src/packing_list_detail.php
@@ -58,11 +58,12 @@ $stmt_list_owner->close();
 $page_title = "Packliste: " . htmlspecialchars($packing_list['name']);
 
 // Robust SQL: Fetches names from Backpacks/Compartments if article is missing
+// FIX: Include backpack own weight in weight_grams calculation
 $sql = "SELECT 
             pli.id, pli.quantity, pli.parent_packing_list_item_id, pli.carrier_user_id,
             pli.backpack_id, pli.backpack_compartment_id,
             COALESCE(a.name, pli.name, bp.name, bpc.name, 'Unbekanntes Item') AS article_name,
-            COALESCE(a.weight_grams, 0) as weight_grams,
+            COALESCE(a.weight_grams, bp.weight_grams, 0) as weight_grams,
             a.image_url, a.product_designation, a.consumable,
             c.name AS category_name, 
             m.name AS manufacturer_name, 
@@ -132,6 +133,20 @@ function get_recursive_quantity($parent_id, $items_by_parent) {
     return $count;
 }
 
+// Helper for recursive weight calculation
+function get_recursive_weight($parent_id, $items_by_parent) {
+    $weight = 0;
+    if (isset($items_by_parent[$parent_id])) {
+        foreach ($items_by_parent[$parent_id] as $child) {
+            // Child weight
+            $weight += ($child['quantity'] * $child['weight_grams']);
+            // Plus its descendants
+            $weight += get_recursive_weight($child['id'], $items_by_parent);
+        }
+    }
+    return $weight;
+}
+
 // Recursive Rendering
 function render_item_row($item, $level, $items_by_parent) {
     $has_children = isset($items_by_parent[$item['id']]);
@@ -159,11 +174,22 @@ function render_item_row($item, $level, $items_by_parent) {
 
     $indent_px = $level * 25;
     $weight_display = $item['weight_grams'] > 0 ? number_format($item['weight_grams'], 0, ',', '.') . ' g' : '-';
-    $total_weight_display = $item['weight_grams'] > 0 ? number_format($item['weight_grams'] * $item['quantity'], 0, ',', '.') . ' g' : '-';
-
-    // Ensure children rows are initially shown or hidden based on some logic? Default shown.
-    // But the toggle button should reflect state. Default expanded -> chevron-down.
     
+    // Calculate Total Weight display logic
+    $total_weight_val = 0;
+    if ($is_backpack || $is_compartment) {
+        // For containers: Recursive weight of children
+        // For backpacks specifically: Add own weight + children
+        $children_weight = get_recursive_weight($item['id'], $items_by_parent);
+        $own_weight = $item['quantity'] * $item['weight_grams']; // Usually 1 * empty_weight
+        $total_weight_val = $own_weight + $children_weight;
+    } else {
+        // Standard items
+        $total_weight_val = $item['weight_grams'] * $item['quantity'];
+    }
+    
+    $total_weight_display = ($total_weight_val > 0) ? number_format($total_weight_val, 0, ',', '.') . ' g' : '-';
+
     echo '<tr class="' . $bg_class . '" data-id="' . $item['id'] . '" data-parent-id="' . ($item['parent_packing_list_item_id'] ?: 0) . '">';
     
     // Name Column with Indentation