diff --git a/src/edit_packing_list_details.php b/src/edit_packing_list_details.php
index e69de29..445bdbd 100644
--- a/src/edit_packing_list_details.php
+++ b/src/edit_packing_list_details.php
@@ -0,0 +1,367 @@
+<?php
+// edit_packing_list_details.php - Bearbeiten von Details und Rucksack-Zuweisung
+$page_title = "Packliste Details bearbeiten";
+
+if (session_status() == PHP_SESSION_NONE) {
+    session_start();
+}
+if (!isset($_SESSION['user_id'])) {
+    header("Location: login.php");
+    exit;
+}
+
+require_once 'db_connect.php';
+require_once 'household_actions.php';
+require_once 'backpack_utils.php'; 
+require_once 'header.php';
+
+$current_user_id = $_SESSION['user_id'];
+$packing_list_id = isset($_GET['id']) ? intval($_GET['id']) : 0;
+$message = '';
+$packing_list = null;
+$can_edit = false;
+
+// --- 1. Permissions & Basic Data ---
+if ($packing_list_id > 0) {
+    $stmt_household_check = $conn->prepare("SELECT household_id FROM users WHERE id = ?");
+    $stmt_household_check->bind_param("i", $current_user_id);
+    $stmt_household_check->execute();
+    $current_user_household_id = $stmt_household_check->get_result()->fetch_assoc()['household_id'];
+    $stmt_household_check->close();
+
+    $stmt_list_check = $conn->prepare("SELECT id, name, description, user_id, household_id, is_template, todo_list_id FROM packing_lists WHERE id = ?");
+    $stmt_list_check->bind_param("i", $packing_list_id);
+    $stmt_list_check->execute();
+    $result = $stmt_list_check->get_result();
+    if ($result->num_rows == 1) {
+        $packing_list = $result->fetch_assoc();
+        $is_owner = ($packing_list['user_id'] == $current_user_id);
+        $is_household_list = !empty($packing_list['household_id']);
+        $is_in_same_household = ($is_household_list && $packing_list['household_id'] == $current_user_household_id);
+
+        if ($is_owner || $is_in_same_household) {
+            $can_edit = true;
+        } else {
+            $message = '<div class="alert alert-danger">Keine Berechtigung.</div>';
+            $packing_list = null;
+        }
+    } else {
+        $message = '<div class="alert alert-warning">Packliste nicht gefunden.</div>';
+    }
+} else {
+    $message = '<div class="alert alert-danger">Keine ID.</div>';
+}
+
+// --- 2. Fetch Data for Dropdowns ---
+$available_users = [];
+$available_todo_lists = [];
+if ($can_edit) {
+    // Owners: Creator + Household Members (if shared)
+    if ($packing_list['household_id']) {
+        $stmt = $conn->prepare("SELECT id, COALESCE(NULLIF(display_name, ''), username) AS username FROM users WHERE household_id = ?");
+        $stmt->bind_param("i", $packing_list['household_id']);
+    } else {
+        $stmt = $conn->prepare("SELECT id, COALESCE(NULLIF(display_name, ''), username) AS username FROM users WHERE id = ?");
+        $stmt->bind_param("i", $packing_list['user_id']);
+    }
+    $stmt->execute();
+    $res = $stmt->get_result();
+    while ($row = $res->fetch_assoc()) {
+        $available_users[] = $row;
+    }
+
+    // Fetch Todo Lists
+    $stmt_tl = $conn->prepare("SELECT id, name FROM todo_lists WHERE user_id = ? OR (household_id IS NOT NULL AND household_id = ?)");
+    $stmt_tl->bind_param("ii", $current_user_id, $current_user_household_id);
+    $stmt_tl->execute();
+    $res_tl = $stmt_tl->get_result();
+    while ($row = $res_tl->fetch_assoc()) {
+        $available_todo_lists[] = $row;
+    }
+    $stmt_tl->close();
+
+    // Current Assignments
+    $current_assignments = [];
+    $stmt_ca = $conn->prepare("SELECT user_id, backpack_id FROM packing_list_carriers WHERE packing_list_id = ?");
+    $stmt_ca->bind_param("i", $packing_list_id);
+    $stmt_ca->execute();
+    $res_ca = $stmt_ca->get_result();
+    while ($row = $res_ca->fetch_assoc()) {
+        $current_assignments[$row['user_id']] = $row['backpack_id'];
+    }
+}
+
+// --- 3. Handle Form Submission ---
+if ($_SERVER["REQUEST_METHOD"] == "POST" && $can_edit) {
+    // Update Basic Details
+    $name = trim($_POST['name']);
+    $description = trim($_POST['description']);
+    
+    // Household sharing logic
+    $new_household_id = NULL;
+    if (isset($_POST['is_household_list']) && $_POST['is_household_list'] == '1' && $current_user_household_id) {
+        $new_household_id = $current_user_household_id;
+    }
+    
+    $todo_list_id = !empty($_POST['todo_list_id']) ? intval($_POST['todo_list_id']) : NULL;
+    
+    $stmt_update = $conn->prepare("UPDATE packing_lists SET name = ?, description = ?, household_id = ?, todo_list_id = ? WHERE id = ?");
+    $stmt_update->bind_param("sssii", $name, $description, $new_household_id, $todo_list_id, $packing_list_id);
+    $stmt_update->execute();
+    $packing_list['name'] = $name;
+    $packing_list['description'] = $description;
+    $packing_list['household_id'] = $new_household_id;
+    $packing_list['todo_list_id'] = $todo_list_id;
+
+    // Handle Participation & Backpacks
+    // Get all potential users to check if they were unchecked
+    $participate_map = $_POST['participate'] ?? []; // Array of UserID => "1" if checked
+    
+    foreach ($available_users as $user) {
+        $uid = $user['id'];
+        $is_checked = isset($participate_map[$uid]);
+        $was_participating = array_key_exists($uid, $current_assignments);
+        
+        if ($is_checked) {
+            // User participates -> Update/Insert Backpack
+            $bid = isset($_POST['backpacks'][$uid]) ? intval($_POST['backpacks'][$uid]) : 0;
+            $bid = ($bid > 0) ? $bid : NULL;
+            
+            if ($was_participating) {
+                $old_bid = $current_assignments[$uid];
+                // Update if changed
+                if ($old_bid != $bid) {
+                    $stmt_up = $conn->prepare("UPDATE packing_list_carriers SET backpack_id = ? WHERE packing_list_id = ? AND user_id = ?");
+                    $stmt_up->bind_param("iii", $bid, $packing_list_id, $uid);
+                    $stmt_up->execute();
+                    
+                    // Cleanup Old Containers
+                    cleanup_old_backpack_containers($conn, $packing_list_id, $uid);
+                    
+                    // Sync New
+                    if ($bid) {
+                        sync_backpack_items($conn, $packing_list_id, $uid, $bid);
+                    }
+                }
+            } else {
+                // New Participant
+                $stmt_in = $conn->prepare("INSERT INTO packing_list_carriers (packing_list_id, user_id, backpack_id) VALUES (?, ?, ?)");
+                $stmt_in->bind_param("iii", $packing_list_id, $uid, $bid);
+                $stmt_in->execute();
+                
+                if ($bid) {
+                    sync_backpack_items($conn, $packing_list_id, $uid, $bid);
+                }
+            }
+        } else {
+            // User NOT checked -> Remove if existed
+            if ($was_participating) {
+                $conn->query("DELETE FROM packing_list_carriers WHERE packing_list_id = $packing_list_id AND user_id = $uid");
+                // Cleanup Items: Delete all items carried by this user?
+                // Or move to unassigned? Let's move to unassigned (NULL) to be safe against data loss.
+                // But Containers (Backpacks) should be deleted.
+                
+                // 1. Delete Containers
+                cleanup_old_backpack_containers($conn, $packing_list_id, $uid);
+                
+                // 2. Move remaining items (loose items) to unassigned?
+                $conn->query("UPDATE packing_list_items SET carrier_user_id = NULL WHERE packing_list_id = $packing_list_id AND carrier_user_id = $uid");
+            }
+        }
+    }
+    
+    $message = '<div class="alert alert-success">Änderungen gespeichert!</div>';
+    // Refresh assignments
+    $stmt_ca->execute();
+    $res_ca = $stmt_ca->get_result();
+    $current_assignments = [];
+    while ($row = $res_ca->fetch_assoc()) {
+        $current_assignments[$row['user_id']] = $row['backpack_id'];
+    }
+}
+
+function cleanup_old_backpack_containers($conn, $list_id, $user_id) {
+    // Find all container items for this user (backpacks or compartments)
+    $stmt = $conn->prepare("SELECT id FROM packing_list_items WHERE packing_list_id = ? AND carrier_user_id = ? AND (backpack_id IS NOT NULL OR backpack_compartment_id IS NOT NULL)");
+    $stmt->bind_param("ii", $list_id, $user_id);
+    $stmt->execute();
+    $res = $stmt->get_result();
+    $container_ids = [];
+    while ($r = $res->fetch_assoc()) $container_ids[] = $r['id'];
+    
+    if (!empty($container_ids)) {
+        $ids_str = implode(',', $container_ids);
+        // Unparent children so they don't get deleted (or keep them and they get deleted? No, save content)
+        // Set parent to NULL for children of these containers
+        $conn->query("UPDATE packing_list_items SET parent_packing_list_item_id = NULL WHERE packing_list_id = $list_id AND parent_packing_list_item_id IN ($ids_str)");
+        
+        // Delete containers
+        $conn->query("DELETE FROM packing_list_items WHERE id IN ($ids_str)");
+    }
+}
+
+$back_link = 'packing_lists.php' . (!empty($packing_list['is_template']) ? '?view=templates' : '');
+$page_headline = !empty($packing_list['is_template']) ? 'Vorlage bearbeiten' : 'Details bearbeiten';
+
+?>
+
+<div class="card">
+    <div class="card-header d-flex justify-content-between align-items-center">
+        <h2 class="h4 mb-0"><?php echo $page_headline; ?>: <?php echo htmlspecialchars($packing_list['name'] ?? ''); ?></h2>
+        <a href="<?php echo $back_link; ?>" class="btn btn-sm btn-outline-light"><i class="fas fa-arrow-left me-2"></i>Zurück</a>
+    </div>
+    <div class="card-body p-4">
+        <?php echo $message; ?>
+
+        <?php if ($packing_list): ?>
+            <form method="post" id="editListForm">
+                <div class="row">
+                    <div class="col-md-8">
+                        <h5 class="mb-3">Basisdaten</h5>
+                        <div class="mb-3">
+                            <label class="form-label">Name</label>
+                            <input type="text" class="form-control" name="name" value="<?php echo htmlspecialchars($packing_list['name']); ?>" required>
+                        </div>
+                        <div class="mb-3">
+                            <label class="form-label">Beschreibung</label>
+                            <textarea class="form-control" name="description" rows="3"><?php echo htmlspecialchars($packing_list['description'] ?: ''); ?></textarea>
+                        </div>
+                        
+                        <?php if (empty($packing_list['is_template'])): ?>
+                        <div class="mb-4">
+                            <label for="todo_list_id" class="form-label fw-bold">ToDo-Liste (optional)</label>
+                            <select class="form-select" id="todo_list_id" name="todo_list_id">
+                                <option value="">-- Keine ToDo-Liste --</option>
+                                <?php foreach ($available_todo_lists as $tl): ?>
+                                    <option value="<?php echo $tl['id']; ?>" <?php if (($packing_list['todo_list_id'] ?? null) == $tl['id']) echo 'selected'; ?>>
+                                        <?php echo htmlspecialchars($tl['name']); ?>
+                                    </option>
+                                <?php endforeach; ?>
+                            </select>
+                            <div class="form-text">Verknüpfe eine ToDo-Liste mit dieser Packliste.</div>
+                        </div>
+                        <?php endif; ?>
+
+                        <?php if ($current_user_household_id): ?>
+                        <div class="form-check form-switch mb-3">
+                            <input class="form-check-input" type="checkbox" role="switch" id="is_household_list" name="is_household_list" value="1" <?php echo !empty($packing_list['household_id']) ? 'checked' : ''; ?>>
+                            <label class="form-check-label" for="is_household_list">Für den gesamten Haushalt freigeben</label>
+                        </div>
+                        <?php endif; ?>
+                    </div>
+                    
+                    <div class="col-md-4">
+                        <h5 class="mb-3">Teilnehmer & Rucksäcke <?php if(!empty($packing_list['is_template'])): ?><small class="text-muted">(Standard)</small><?php endif; ?></h5>
+                        <div class="card bg-light border-0">
+                            <div class="card-body">
+                                <p class="small text-muted">Wähle hier, wer mitkommt und welchen Rucksack er trägt.</p>
+                                
+                                <div id="backpack-warning" class="alert alert-warning d-none small p-2 mb-2">
+                                    <i class="fas fa-exclamation-triangle me-1"></i> Ein Rucksack wurde mehrfach ausgewählt!
+                                </div>
+
+                                <?php 
+                                $all_assigned_backpack_ids = array_values($current_assignments);
+                                $user_backpacks_json = [];
+                                
+                                foreach ($available_users as $user): 
+                                    $user_backpacks = get_available_backpacks_for_user($conn, $user['id'], $packing_list['household_id']);
+                                    $is_participating = array_key_exists($user['id'], $current_assignments);
+                                    $my_current_bp_id = $current_assignments[$user['id']] ?? 0;
+                                    
+                                    $user_backpacks_json[$user['id']] = [
+                                        'current_id' => $my_current_bp_id,
+                                        'backpacks' => $user_backpacks
+                                    ];
+                                ?>
+                                    <div class="mb-4 border-bottom pb-3">
+                                        <div class="form-check mb-2">
+                                            <input class="form-check-input participation-check" type="checkbox" name="participate[<?php echo $user['id']; ?>]" value="1" <?php echo $is_participating ? 'checked' : ''; ?> id="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>
+                                        <div class="ms-4 backpack-selector-wrapper" style="<?php echo $is_participating ? '' : 'opacity: 0.5; pointer-events: none;'; ?>">
+                                            <?php echo render_backpack_card_selector($user, $my_current_bp_id, $user_backpacks); ?>
+                                        </div>
+                                    </div>
+                                <?php endforeach; ?>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+                
+                <hr class="my-4">
+
+                <div class="d-flex justify-content-between">
+                    <a href="manage_packing_list_items.php?id=<?php echo $packing_list_id; ?>" class="btn btn-info text-white"><i class="fas fa-boxes me-2"></i>Inhalt bearbeiten</a>
+                    <button type="submit" class="btn btn-primary" id="submitBtn"><i class="fas fa-save me-2"></i>Speichern & Synchronisieren</button>
+                </div>
+            </form>
+        <?php endif; ?>
+    </div>
+</div>
+
+<!-- Render Modal JS -->
+<?php echo render_backpack_modal_script($user_backpacks_json, $all_assigned_backpack_ids); ?>
+
+<script>
+document.addEventListener('DOMContentLoaded', function() {
+    const submitBtn = document.getElementById('submitBtn');
+    const warning = document.getElementById('backpack-warning');
+    
+    // Toggle Opacity logic
+    document.querySelectorAll('.participation-check').forEach(chk => {
+        chk.addEventListener('change', function() {
+            const wrapper = this.closest('.mb-4').querySelector('.backpack-selector-wrapper');
+            if (this.checked) {
+                wrapper.style.opacity = '1';
+                wrapper.style.pointerEvents = 'auto';
+            } else {
+                wrapper.style.opacity = '0.5';
+                wrapper.style.pointerEvents = 'none';
+            }
+            validateBackpacks();
+        });
+    });
+
+    // Validation Logic (Copied from add_packing_list.php)
+    function validateBackpacks() {
+        const selected = [];
+        let hasDuplicate = false;
+        
+        const inputs = document.querySelectorAll('input[name^="backpacks["]');
+        
+        inputs.forEach(input => {
+            const userIdMatch = input.name.match(/backpacks\[(\d+)\]/);
+            if (userIdMatch) {
+                const userId = userIdMatch[1];
+                const partCheck = document.getElementById('part_' + userId);
+                
+                if (partCheck && partCheck.checked) {
+                    const val = parseInt(input.value);
+                    if (val > 0) {
+                        if (selected.includes(val)) {
+                            hasDuplicate = true;
+                        }
+                        selected.push(val);
+                    }
+                }
+            }
+        });
+        
+        if (hasDuplicate) {
+            warning.classList.remove('d-none');
+            submitBtn.disabled = true;
+        } else {
+            warning.classList.add('d-none');
+            submitBtn.disabled = false;
+        }
+    }
+    
+    document.body.addEventListener('hidden.bs.modal', validateBackpacks);
+    validateBackpacks();
+});
+</script>
+
+<?php require_once 'footer.php'; ?>
\ No newline at end of file
diff --git a/src/manage_packing_list_items.php b/src/manage_packing_list_items.php
index 1b171ca..5a59c2f 100644
--- a/src/manage_packing_list_items.php
+++ b/src/manage_packing_list_items.php
@@ -242,11 +242,11 @@ $conn->close();
     </div>
 </div>
 
-<div class="row g-2 flex-nowrap" style="height: calc(100vh - 220px); min-height: 600px; overflow-x: auto;" id="main-panes-container">
+<div class="row g-2 flex-nowrap" style="height: calc(100vh - 160px); min-height: 600px; overflow-x: auto;" id="main-panes-container">
     <!-- LAGER -->
     <div class="<?php echo $col_class_lager; ?> h-100" id="pane-lager">
-        <div class="card h-100">
-            <div class="card-header bg-light">
+        <div class="card h-100 d-flex flex-column border-0 shadow-sm">
+            <div class="card-header bg-light flex-shrink-0">
                 <h5 class="mb-2"><i class="fas fa-boxes me-2"></i>Lagerbestand</h5>
                 <div class="row g-2">
                     <div class="col-12"><input type="text" id="filter-text" class="form-control form-control-sm" placeholder="Artikel suchen..."></div>
@@ -256,7 +256,7 @@ $conn->close();
                     <div class="col-sm-6 col-md-3"><select id="sort-by" class="form-select form-select-sm"><option value="name_asc">Alphabet (A-Z)</option><option value="weight_asc" selected>Gewicht (Leicht->Schwer)</option><option value="weight_desc">Gewicht (Schwer->Leicht)</option><option value="quantity_desc">Anzahl (Viele->Wenige)</option></select></div>
                 </div>
             </div>
-            <div class="card-body pane-content" id="lager-container"></div>
+            <div class="card-body pane-content flex-grow-1" id="lager-container" style="overflow-y: auto;"></div>
         </div>
     </div>
 
@@ -267,11 +267,11 @@ $conn->close();
 
     <!-- TISCH -->
     <div class="<?php echo $col_class_table; ?> h-100" id="pane-table">
-        <div class="card h-100 border-info">
-            <div class="card-header bg-info text-white">
+        <div class="card h-100 border-info d-flex flex-column shadow-sm">
+            <div class="card-header bg-info text-white flex-shrink-0">
                 <h5 class="mb-0"><i class="fas fa-table me-2"></i>Auf dem Tisch</h5>
             </div>
-            <div class="card-body pane-content table-nested-sortable" id="table-container" data-carrier-id="null">
+            <div class="card-body pane-content table-nested-sortable flex-grow-1" id="table-container" data-carrier-id="null" style="overflow-y: auto;">
                 <!-- Items dropped here get carrier_id=null -->
             </div>
         </div>
@@ -279,11 +279,11 @@ $conn->close();
 
     <!-- RUCKSACK -->
     <div class="<?php echo $col_class_rucksack; ?> h-100" id="pane-rucksack">
-        <div class="card h-100 border-success">
-            <div class="card-header bg-success text-white">
+        <div class="card h-100 border-success d-flex flex-column shadow-sm">
+            <div class="card-header bg-success text-white flex-shrink-0">
                 <h5 class="mb-0"><i class="fas fa-backpack me-2"></i>Rucksäcke</h5>
             </div>
-            <div class="card-body pane-content" id="carriers-container"></div>
+            <div class="card-body pane-content flex-grow-1" id="carriers-container" style="overflow-y: auto;"></div>
         </div>
     </div>
 </div>
diff --git a/src/todo_lists.php b/src/todo_lists.php
index 0d461be..0289401 100644
--- a/src/todo_lists.php
+++ b/src/todo_lists.php
@@ -135,7 +135,7 @@ $active_list_id = isset($_GET['list_id']) ? intval($_GET['list_id']) : (!empty($
                             <h5 class="mb-0 py-2"><i class="fas fa-tasks me-2 text-muted"></i><?php echo htmlspecialchars($active_list_name); ?></h5>
                         </div>
                         <div class="card-body p-4">
-                            <ul class="list-group list-group-flush mb-4">
+                            <ul class="list-group shadow-sm mb-4">
                                 <?php foreach ($items as $item): ?>
                                     <li class="list-group-item d-flex justify-content-between align-items-center py-3 px-2 border-bottom">
                                         <form method="post" style="display:inline; margin:0;" class="flex-grow-1">
@@ -188,4 +188,7 @@ require_once 'footer.php';
 if (isset($conn) && $conn instanceof mysqli) {
     $conn->close();
 }
+?>isset($conn) && $conn instanceof mysqli) {
+    $conn->close();
+}
 ?>
\ No newline at end of file