Synapse shoulder strap clip question

[pretzelb]

On my new Synapse I have a clip that is on the right should strap just under the chest strap. It's plastic and can be moved up and down the strap but I'm not sure what it's for. Since there's only one I assume it's not to hang a camera from. Any ideas?

[falconea]

It's to hold the tube for a hydration bladder.

Audrey