Everyone at Bauer is very knowledgeable and friendly when you walk in. They usually will have beer or wine tastings going on in the store. I would suggest signing up for their emails when you check out to be sure you don't miss any deals or tastings.
Libation shop is a trove of craft beers and accessible wine.
With such a prime Back Bay locale and few nearby competitors, any halfway decent packie could probably just scrape by. However, Bauer goes the extra mile as a solid stopover in any respect, with a diverse assortment (in all price points) of wine, spirits, liqueurs, sake. But the piece de resistance is a craft beer selection to make a grown, of-age adult cry (including bombastic Belgian ales, locals like Pretty Things and Berkshire Brewing Co. and obscure cult favorites). Keep your eye out for perpetually snoozing resident cat (named Gris) and markdown specials.