The Spar : VX is a lightweight, weatherproof sling pack designed to carry the daily essentials. One of our most compact bags, it can be worn in either single-strap sling configuration or as a backpack with optional backpack harness. The Spar : VX features VX diamond ripstop fabric from Dimension Polyant . Our VX is one of the most advanced textiles in the world with virtually unmatched abrasion and tear resistance per gram weight.