Ingredients:
1x 2.5 gal ball lock keg from OBK http://www.ontariobeerkegs.com/2_5_Gall ... no-keg.htm These are now out of stock, but I am pretty sure the 3 gal will work as well
1x Ball lock MFL Gas disconnect, available all over the place
1x 5 gal home depot beverage cooler
1x Picnic faucet with beer line and disconnect
1x Keg charger + cartridges http://www.ontariobeerkegs.com/product_ ... harger.htm I found out that you can use threaded cartridges for bb guns with the keg charger, those are available at wal mart for fraction of the price that obk sells them for.

The keg charger, I always carbonated the beer before I left with CO2 from my keezer or priming sugar, so the charger was just there to maintain serving pressure.

And the whole thing assembled, you can easily fit a bag and half of ice beneath and on top of the setup. Keeps the keg cold for 2-3 days.

Overall cost was around $120, but drinking your own beer out in the woods is priceless
