Beer growlers, delivered in Phila.

In late 2014, restaurateur Chris Fetfatzes asked the Pennsylvania Liquor Control Board how his restaurants could legally deliver beer to customers' doors.

The LCB's chief counsel issued an opinion, and what followed was a run in the state on "transporter-for-hire" licenses, allowing businesses to deliver two six-packs (no more than 192 fluid ounces) of beer to one address.

On Monday, Jan. 25, Fetfatzes's beer-delivery business, Quick Sip, will begin to sell growlers across a swath of Philadelphia. The 64-ounce bottles are filled by tap at Hawthornes, one of three restaurants that he operates with his wife, Heather. Fetfatzes uses a proprietary filling system that keeps the beer fresh in the bottle for seven months.

Quick Sip's delivery area - now the sports complex roughly north to Vine Street, river to river - will expand in the next several weeks to include Northern Liberties and Fishtown.

Quick Sip will start with three growler varieties - Tired Hands Hop Hands, Tired Hands Saison Hands, and Half Acre Daisy Cutter Clone - with plans to expand to eight varieties. They cost $15; an empty growler is $4.99.

"It's how you would get milk back in the day," said Fetfatzes, conjuring images of metal boxes on the doorstep and wee-hour swaps of empty milk bottles for full ones. (The rules for beer delivery, however, prohibit just that. Adult signature is required.)

Want the hard stuff? Instacart delivers wine and spirits to residential addresses.