Don't have a growler handy? Then dump out the milk and take the empty carton to the nearest pub for a fill-up. The bartender won't even think twice about it when he sees that you're rocking the HippyTree Growler Long-Sleeve Button-Down Flannel. With dual pockets to stow your ID and credit card, the Growler Flannel is a bubbly beverage connoisseur's new best friend.