A bag-in-box or BiB is a container for the storage and transportation of liquids.

It consists of a strong bladder (or plastic bag), usually made of several layers of metallised film or other plastics, seated inside a corrugated fiberboard box.

Features 

The bag is supplied to the company which will fill it as an empty pre-made bag. The company filling the bag with its product generally removes the tap, fills the bag (with wine, juice or other liquid) and replaces the tap and then the bag is placed in the box.

The bags are available as singles for semi-automatic machines or as web bags, where the bags have perforations between each one. These are used on automated filling systems where the bag is separated on line either before the bag is automatically filled or after. Depending on the end use, there are a number of options that can be used on the bag instead of the tap. The bags can be filled from chilled product temperatures up to 85 °C (185 °F).

BiB packaging can be made using form seal fill (FSF) technology, where the bags are manufactured on-line from reels of film, then the FlexTap is inserted then filled on an integral rotary head filler. The BiB is currently used to package wine, soda fountain syrup products, milk, liquid chemicals, and water.

Uses 

BiB has many common commercial applications. Among the most common ones are to supply syrup to soft drink fountains and to dispense bulk supplied condiments such as ketchup or mustard in the foodservice industry (especially in fast food outlets). BiB technology is still used for its original application of dispensing sulfuric acid for filling lead-acid batteries in garages and dealerships. As explained further below, BiBs have also been implemented for consumer applications like boxed wine.

For commercial syrup applications, the customer opens one end of the box (sometimes via a pre-scored opening) and connects a compatible connector to a built-in port on the bag to pump out its contents. The port itself contains a one-way valve which opens only under pressure from the attached connector and which prevents contamination of the syrup in the bag. For consumer applications like boxed wine, there is a tap already present on the bag which protrudes through a pre-cut hole on the box, so all the consumer has to do is locate the tap on the outside of the box.

Producers like BiB packaging because it is inexpensive. BiB also offers environmental benefits by allowing contents of 1.5–1000 liters, so that less packaging or labeling is required. The material it is made from is lighter than the other plastic alternatives, providing it with a better carbon footprint.