Box wine stays fresh for weeks without requiring argon gas to maintain freshness once opened.
Box is a cheaper and easy transportable packaging option with a significant cost savings without the compromise in quality.
Other eco-friendly benefits exists, it is recyclable with a lower carbon footprint than heavy glass bottles. Transportation costs are lower as well.

Lengthy Wine Storage:  4-6 weeks once opened.  

3L Box  =   4  bottles (750ml standard bottles)

5L Box  =  6 ½  bottles

White wine boxes can be kept in the refrigerator and ready to pour on demand.
No stress to have a glass of wine without immediate concern of oxidation, hence, decline of quality.