srcset and custom field get_post_meta and wp_get_attachment_url

Just put two and two together:

<img src="https://wordpress.stackexchange.com/questions/217554/<?php $bigimg = get_post_meta( $post->ID,"bg_file', true ); echo wp_get_attachment_url( $bigimg ); ?>" srcset="https://wordpress.stackexchange.com/<?php echo wp_get_attachment_image_srcset( $bgimg, 'medium' ) ?>"  alt="" />

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