An advantage of bag-in-box wine is that it can last much longer than an open bottle, depending upon how quickly you drink it, of course. So-called ‘BiB’ wines also tend to be lighter and easier to carry and store.
With many countries under lockdown due to the outbreak of Covid-19, bag-in-box wine could be a good way of stocking up.
In general, it will state somewhere on the box roughly how long the wine can stay fresh.
Some producers say wines can last for up to six weeks after opening. That compares to just a few days for many bottled wines, although fortified styles, like Port, will go for longer.