Geared up for work. I was happy to find the bottle sling clips perfectly to the lunch box AND provides a strap that can clip to the lunch box : r/YetiCoolers
YETI® Small Bottle Carry Sling – YETI UK LIMITED
YETI® Small Bottle Carry Sling – YETI UK LIMITED
YETI® Large Bottle Carry Sling – YETI UK LIMITED
YETI Rambler Bottle Sling Large Charcoal | The Sporting Lodge