Yes! Ceres Chill assembles with all that you need to double pump with a hands-free bra. With each Ceres Chill, you get one lightweight (360ML) 12-ounce Milk Chamber (it weighs less than an 240ML or 8 oz capacity plastic bottle) that connects directly to your pump and another light 3-ounce capacity chamber which doubles as the Cup so you can easily pump both sides without bringing a ton of extra plastic in a cooler with you everywhere you go.