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You've sent the invites, lined up the playlist, and now you're staring at a beer menu that asks a deceptively simple question: keg, bottles, or cans? The answer changes with headcount, the venue, how long people will actually be drinking, and how much work you want on your own plate. Get it right and the bar basically runs itself. Get it wrong and you're either floating in leftover beer or pumping foam into a cup while thirty people watch.
Here's how the three formats compare on the things that matter most: cost, freshness, setup, and waste.
Do the math before you fall in love with the idea of a keg. A standard half-barrel keg holds 15.5 gallons, which works out to roughly 165 twelve-ounce pours. A sixth-barrel (sixtel) holds about 5.2 gallons, or around 55 pours, and fits in a lot of home fridges and small kegerators.
Packaged beer is easier to picture. A 24-pack of 12-ounce cans or bottles is 288 ounces, about 1.8 gallons. So one half-barrel keg is roughly equal to seven cases of cans. Now ask yourself honestly: will your guest list drink seven cases' worth of that one beer?
Two more numbers to keep in mind. Guests drink fastest in the first two hours and taper off after that, so a four-hour party does not mean four drinks per person per hour. And a keg that isn't finished doesn't keep the way unopened cans do.
Keg beer usually has the lowest price per ounce, especially for a crowd-pleasing lager or pale ale. That advantage shrinks once you add the accessories: a deposit on the shell, tap rental or purchase, a CO2 tank and regulator if you don't own them, line and coupler, ice, and possibly a jockey box or kegerator to keep it cold. Delivery fees apply to kegs too, and some retailers add paperwork requirements that vary by location, so confirm with the shop.
Cans and bottles cost more per ounce, but you buy exactly what you need, and whatever isn't opened keeps for months. Cans are typically a little cheaper than bottles of the same beer and cheaper to ship, which shows up in the price.
Kegs have a real advantage: beer goes into the shell cold, under pressure, and never sees light. Hop-forward beers stay brighter in a keg than in a bottle sitting on a warm shelf. The catch is what happens after you tap it. CO2 escapes, oxygen creeps in through the lines and the headspace, and flavor fades. A tapped keg is at its best within a day or two if it stays cold and properly pressurized. If you plan to nurse it for a week at room temperature, cans will taste better.
Cans are the best packaging for shelf life. They block light completely and seal out oxygen well, which is why you see brewers move hoppy beers into cans. Bottles work fine, but clear and green glass let light in and can give beer that skunky aroma, and even brown glass isn't perfect.
Whichever you choose, buy from a shop with fast turnover and check for a packaged-on or best-by date. Freshness beats format when the beer is close.
Cans and bottles are close to zero-effort. Chill them, dump them in a tub with ice and water, set out an opener and a stack of cups, and guests serve themselves all night. That's the whole job.
A keg needs more attention:
Also plan for one person to own the tap. Someone has to swap a kicked keg, wipe up spills, and keep an eye out. If nobody wants that role, go with cans. And check the venue rules: pools, parks, beaches, and some event spaces ban glass outright, which makes cans the practical choice.
Kegs are reusable, but only if you return the shell and tap on time. Miss the return window and you forfeit the deposit. A half-full keg is the real waste: it goes flat, oxidizes, and unless you have a counter-pressure filler and the patience to use it, most of it gets dumped.
Cans and bottles generate more material, though both recycle widely. Cans crush down and take up less bin space, and bottles are heavier to haul. Unopened leftovers are the quiet win here: they go back in the fridge or the cooler and reappear at the next gathering instead of down the drain.
Estimate roughly two drinks per guest for the first two hours, then one per hour after, and order slightly more than you think you need. Running dry is worse than a few spare cases. Kegs need a firm headcount and a beer most people will drink; cans and bottles forgive uncertainty. Check local rules on keg sales and alcohol service with your retailer, keep water and food within reach, and arrange rides home before the party starts.
If you're still torn, the safest party setup is a small keg of something dependable plus a few cases of cans for variety and stragglers. You get the low cost per pour when the crowd is thirsty, and a shelf-stable backup when it isn't. Order early, chill everything a day ahead, and buy more ice than you think you need. That's the difference between hosting and bartending all night.
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