diff --git a/api/src/main.rs b/api/src/main.rs
index a818d14..3600bf6 100644
--- a/api/src/main.rs
+++ b/api/src/main.rs
@@ -1,49 +1,127 @@
+#[derive(Debug)]
+enum Period {
+    Days(i32),
+}
+
 #[derive(Debug)]
 enum ItemUsage {
     Singleton,
     Once,
-    Periodic(i32),
+    Periodic(Period),
 }
 
 #[derive(Debug)]
 struct PackageItem {
     name: String,
-    usage: ItemUsage
+    usage: ItemUsage,
 }
 
 impl PackageItem {
     fn new(name: String, usage: ItemUsage) -> PackageItem {
-        PackageItem{
+        PackageItem {
             name: name,
             usage: usage,
         }
     }
 }
 
-struct PackageList<'a> {
+#[derive(Debug)]
+enum TripItemStatus {
+    Pending,
+    Ready,
+    Packed,
+}
+
+#[derive(Debug)]
+struct TripItem<'a> {
+    package_item: &'a PackageItem,
+    status: TripItemStatus,
+}
+
+impl TripItem<'_> {
+    fn from_package_item(package_item: &PackageItem) -> TripItem  {
+        TripItem {
+            package_item: package_item,
+            status: TripItemStatus::Pending,
+        }
+    }
+}
+
+#[derive(Debug)]
+struct PackageList {
     name: String,
-    items: &'a[PackageItem],
+    items: Vec<PackageItem>,
+}
+
+#[derive(Debug)]
+struct TripList<'a> {
+    items: Vec<TripItem<'a>>,
+}
+
+impl<'a> TripList<'a> {
+    fn from_package_list(list: &'a PackageList) -> TripList<'a> {
+        TripList {
+            items: vec![TripItem::from_package_item(&list.items[0])],
+        }
+
+    }
+}
+
+#[derive(Debug)]
+struct Trip<'a> {
+    name: String,
+    date: String,
+    list: TripList<'a>,
+}
+
+impl<'a> Trip<'a> {
+    fn from_package_list(name: String, date: String, list: &'a PackageList) -> Trip<'a> {
+        Trip {
+            name: name,
+            date: date,
+            list: TripList::from_package_list(list),
+        }
+    }
 }
 
 fn main() {
     let package_list_camping = PackageList {
         name: String::from("camping"),
-        items: &[
+        items: vec![
+            PackageItem::new(String::from("Rucksack"), ItemUsage::Singleton),
             PackageItem::new(String::from("Schlafsack"), ItemUsage::Singleton),
             PackageItem::new(String::from("Zelt"), ItemUsage::Singleton),
             PackageItem::new(String::from("Luftmatratze"), ItemUsage::Singleton),
             PackageItem::new(String::from("Campingstuhl"), ItemUsage::Singleton),
             PackageItem::new(String::from("Regenjacke"), ItemUsage::Singleton),
             PackageItem::new(String::from("Tasse"), ItemUsage::Singleton),
+            PackageItem::new(String::from("Trinkblase"), ItemUsage::Singleton),
+            PackageItem::new(String::from("Trinkflasche"), ItemUsage::Singleton),
             PackageItem::new(String::from("Topf"), ItemUsage::Singleton),
             PackageItem::new(String::from("Messer"), ItemUsage::Singleton),
             PackageItem::new(String::from("Messer"), ItemUsage::Singleton),
-            PackageItem::new(String::from("Unterhose"), ItemUsage::Periodic(1)),
+            PackageItem::new(
+                String::from("Unterhose"),
+                ItemUsage::Periodic(Period::Days(1)),
+            ),
         ],
     };
 
-    println!("Contents for package list {:?}:", package_list_camping.name);
-    for item in package_list_camping.items {
+    println!("Contents of package list {:?}:", package_list_camping.name);
+    for item in &package_list_camping.items {
+        println!("{:?}", item);
+    }
+
+    println!("Now we're starting an actual trip!");
+
+    let trip = Trip::from_package_list(
+        String::from("Campingtrip"),
+        String::from("2021-09-06"),
+        &package_list_camping,
+    );
+
+    println!("Package list for trip {:?} at {:?}:", trip.name, trip.date);
+    for item in &trip.list.items {
         println!("{:?}", item);
     }
 }