"This leather-wrapped stainless-steel bottle flask from the Alabama-based outdoors company Tom Beckbe is made for sharing a post-hunt nip or pre-game sip. It holds eight ounces and includes four toasting cups that snap securely onto the top, so you can pass around a flask without having to actually pass around the flask."
https://gardenandgun.com/articles/six-ways-to-boost-your-bourbon-bar/