Sharing object instance between files

I want to share a object instance between different php files used when creating meta boxes for a custom post type.

The reason is that I dont want to to load the same information from every included file.

From register_post_type i call the following function to create the meta boxes:

function my_new_meta_box( $post ) {

$video = new MyClass( $post->ID );

# Example meta box
add_meta_box( 'mbtest1', __( 'XXX', 'abc' ), function() { include( MY_DIR . 'metabox/metabox1.php' ); }, 'mycpt', 'normal', 'default' );

# Example meta box
add_meta_box( 'mbtest2', __( 'XXX', 'abc' ), function() { include( MY_DIR . 'metabox/metabox2.php' ); }, 'mycpt', 'normal', 'default' );
}

Is there any ‘good’ way to do this, without the use of a global variable?

Thanks in advance!