Backpack preferences. (#2864)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Shared/Preferences/BackpackPreference.cs

@@ -0,0 +1,12 @@
+namespace Content.Shared.Preferences
+{
+    /// <summary>
+    /// The backpack preference for a profile. Stored in database!
+    /// </summary>
+    public enum BackpackPreference
+    {
+        Backpack,
+        Satchel,
+        Duffelbag
+    }
+}