1.Description The double-container drink dispenser can hold up to 6 liters of drinks, and it comes with a backpack that is easy to carry and allows you to enjoy your different drinks wherever you go. It might also be a highlight of service if used in a restaurant or bar. 2.Key Features Large Capacit... Read more
You can also get the wine tote bags fom Etsy!
Not a backpack, but this wine tote bag is cool!
I found this one on eBay.
These are very common.