This is soap-on-a-rope redefined. 

This U.S. military-grade tactical soap pouch should be standard-issue for every shower. To maximize hygiene in tactical situations, this equipment is engineered with a coarse mesh to scrub your hands and feet, and a softer mesh for less rough areas. The 550-mil-spec paracord keeps your large soap off the ground. Perfect for home, outdoor, field, or prison showers.