The 
NUPROL NP TWO POINT SHOULDER STRAP SLING TAN
 is a versatile and durable airsoft sling that can also convert to a single-point configuration. It features quick-detach buckles and bungee sections for comfort and ease of use. 
 
Key Features and Specifications
Material: The sling is constructed from heavy-duty 1000D Cordura Nylon with solid polymer main buckles and metal clips.
Design: It is a two-point sling design but can be converted into a one-point sling by connecting the metal clasps to a D-ring.
Comfort: It is designed to be comfortable and effective, featuring a padded shoulder strap (for the "Shoulder Strap Sling" variant, as distinct from the "Bungee Sling" which features bungee sections) and a fully adjustable strap to fit various body types and body armor. The bungee supports help absorb the weight and shock of a dropped weapon.
Connection: It includes H&K style metal clips for secure attachment to the weapon's sling points, as well as two strong cloth adapters for use with weapons that have smaller sling loops.
Adjustability: The sling is fully adjustable and features anti-slip quick pull tabs for quick length adjustments.
Dimensions: According to Nuprol.com, the Bungee Sling version has a maximum length of approximately 172cm.