I just purchased some 5 gallon containers (kegs actually) in order to create larger batches of beer.  I'll still be using my single gallon jugs for most of my work, but when/if I find a recipe I or other like, I'll try making a larger batch. 

The kit came with a keg, a small 2.5 pound co2 tank and two lines with a regulator and connections.
The CO2 tank supplies the carbon dioxide which is used to a) carbonate the liquid, and/or b) create pressure to push the liquid out through a dispenser.  With a being slightly optional.  For instance, I could fill it with plain grape juice and use the CO2 to push plain grape juice out into cups from a dispenser end, or I could use water and some flavored syrup and make a soda by pressurizing the liquid with the CO2 then pushing it out.  The kegs were originally soda kegs.
The regulator is a really odd looking device which connects to the CO2 tank and regulates the pressure being sent from the tank to the keg.  Too little, and nothing happens, too much co2 and everything gets way too fizzy, or worse can kind of blow up.
Next is the keg, rather a soda keg.  This is connected to the regulator by a plastic tube and will contain a liquid beer, soda or water, which is then pressurized and/or pushed out by the incoming co2.  The liquid of course has to leave somewhere and will leave via the other opening of the keg where the other line goes with a valve at the end to open and close so that it will dispense the liquid.  It'd be bad to have all 5 gallons keep going without a way to stop it.

I'd have prefered a larger tank, and I should have seen about getting a larger one with the kit, but the discount was pretty decent due to the Black Friday tradition and I didn't think to message first for a custom kit.  It would have taken longer and I could have missed the deal anyways.  The place where I got my co2 tank filled does have refurbished tanks and it seems that it would be cost effective to get the largest one.  A 5 pound tank is 75, a 10 pound 85 and a 15 pound for 95 dollars.  The refills are 10, 12 and 14.50 respectively, meaning that for a 15 pound tank, it's less than a dollar a pound of co2.  Now my 2.5 tank cost me 8.25 to fill up, making it over 3 dollars a pound.  Given that it takes approximately (per some people's reviews) .35 pounds to push 5 gallons of beer out of a keg, then this gives me 8 kegs worth.  If I pressurize the beer using these kegs, it would be an additional .7 pounds, giving me only 4 kegs worth.  I have a feeling that I will be purchasing a 15-20 pound tank fairly soon.  Ideally I'll be creating the beer and letting it pressurize on it's own first.  After which I won't have to deal with it until I felt like bottling it from the keg. 

Normally, a person would dispense it into glasses from the keg but I don't think that I'll have a cold enough place for it, except for outside, until I have a fridge large enough to hold the keg tanks.  There are people who will use a freezer unit that they keep from totally freezing by using a power supply unit that will cease the power when it gets too cold, or start up the power when it gets too warm.

For the moment, all I plan on doing is carbonating water in 2 liter bottles so I can make my own sodas.  I've already done this once since getting the kit and I've been adding the carbonated water to a tart cherry juice concentrate.  Really tasty and not too sweet.

Now as for the first batch of beer, there were 4 variations of the same recipe.  Yet it seems that somehow they tasted different, either from the temperature, or the time, or something not apparent.
All 4 batches used sorghum syrup:
Batch code 3 used:
Saflager 34
1.4 pounds sorghum syrup
2 ounces(weight) dextrose (corn sugar)
one gallon of water 
Mount Hood hops 6 grams of hop pellets 30 minutes
9 grams of the same hops when the heat was turned off.

The second batch (Code 4) was the same but the hops used were: Roughly 9 and 7 grams
The third batch (code 5 and 6) used the same, except for the hops again.  1/2 ounce (weight) in the boil for 30-60 minutes, then another half of an ounce during coolingI also added 3 tablespoons of brown rice syrup solids and one tablespoon of corn sugar, this is to increase the sugar content and perhaps some flavor as well.  This batch was given the same yeast (from the same opened packet.)
Fifth and sixth batch
1/2 oz  Mt Hood hops (30)
1/2 oz. Mt Hood hops (flameout)
3 T dextrose
3 T brown rice syrup solids
in addition to the same as above.

So, with minor variations yet using the same amount of extract, all four batches should not have been widely different.  Yet somehow 3 and 6 came out better than 4 and 5, or so people said.  It makes sense that 3 and 4 would be less bitter due to the less hops, but for the variation to be that different is odd.

I'll try it again in a 5 gallon batch, however after some review of what I'll need, it seems that I'll be needing many more parts including:
A ball lock valve for the keg, which I will then connect to a hose then into a bucket of water so it can ferment without getting bacteria or air in.
A wort chiller (which is copper refridgeration tubing that will be immersed into the boiled sugar liquid and where when cold water is run through the tubing will chill the liquid) as well as sanitizers.  It also seems that I lost the nylon washer that's supposed to stop the CO2 from leaking out during the pressurizing process.  I picked up a nylon washer from home depot, but because the shape isn't the same, it doesn't work as well.
I'll also need cleaners and sanitizers as well as the brewing supplies themselves (sorghum syrup, hops, yeast).

Because this puts me over my current budget, I'll have to wait and pick these up at a later time.  It will cost me another 200, but it's a fun and useful hobby to have.  I get to make things and it gets to be used.