Things that is improved upon: My only complaint the following pack is it doesn't quite have the frame to comfortably have a super heavy load. https://www.energias-renovables.com/publico/control_clics.php?id_mail=8553&mensaje=1874&Enlace=aHR0cHM6Ly9iYXJiZWN1ZWp1bmN0aW9uLmNvbS9ibG9nLzg4ODQ0L3JldHJvLWdhbWluZy1kaXNjdXNzaW9uLXN1cGVyLW1hcmlvLXJwZy1wYXJ0LXR3by8