Plastic pocket + Cap + Cardboard - Empty 5L bag in box
What is Bag-in-box Packaging? | SIG
Amazon.com: 3L Bag-In-Box Bags [Eco-Friendly Glass Bottle Alternative] - Easily Bottle, Dispense & Store Your Wines, Coffees, Cocktails and More! - Great for Home Winemakers (Bag In Box Bags Only, 6 pack):