REI is a leash connector with a carabiner a D ring on each end, and can be used flexibly as:

CROSS BODY CONFIGURATION for MELLEM or NOMAD*
CONNECTOR for another gear such as to a dog walking belt

Size:

NARROW ¾" or 2cm wide
WIDE 1" or 2.5cm wide

REI in wide is recommended for the cross body configuration for the NOMAD, only the D ring of the wide style allows the long line to pass through (see gif on this listing). 

• 100% waterproof and will never retain moisture
• 30" or 76cm long
• easy to clean
• single hand clip with a 360 degrees rotatable swivel at one end
• odor proof to prevents bacteria growth
• rust resistant hardware
• box X stitching for lifetime durability