diff --git a/pkg/game/items.go b/pkg/game/items.go
new file mode 100644
index 0000000..4307454
--- /dev/null
+++ b/pkg/game/items.go
@@ -0,0 +1,14 @@
+package game
+
+// Each item is a specific type
+const (
+	ItemNone = byte(0)
+
+	// Describes a single rock
+	ItemRock = byte(1)
+)
+
+// Item describes an item that can be held
+type Item struct {
+	Type byte `json:"type"`
+}
diff --git a/pkg/game/rover.go b/pkg/game/rover.go
index 53ba7ff..da58ca8 100644
--- a/pkg/game/rover.go
+++ b/pkg/game/rover.go
@@ -18,6 +18,9 @@ type RoverAttributes struct {
 
 	// Pos represents where this rover is in the world
 	Pos vector.Vector `json:"pos"`
+
+	// Capacity represents the maximum number of items the rover can carry
+	Capacity int `json:"capacity"`
 }
 
 // Rover describes a single rover in the world
@@ -27,4 +30,7 @@ type Rover struct {
 
 	// Attributes represents the physical attributes of the rover
 	Attributes RoverAttributes `json:"attributes"`
+
+	// Inventory represents any items the rover is carrying
+	Inventory []Item `json:"inventory"`
 }
diff --git a/pkg/game/world.go b/pkg/game/world.go
index aad9a26..b248ef6 100644
--- a/pkg/game/world.go
+++ b/pkg/game/world.go
@@ -88,9 +88,10 @@ func (w *World) SpawnRover() (uuid.UUID, error) {
 	rover := Rover{
 		Id: uuid.New(),
 		Attributes: RoverAttributes{
-			Speed: 1.0,
-			Range: 5.0,
-			Name:  "rover",
+			Speed:    1.0,
+			Range:    5.0,
+			Capacity: 5,
+			Name:     "rover",
 		},
 	}