The best replacement for keg is cases.

The best alternatives to keg are rated as following:
★★★★★  cases
★★★★★  cans
★★  pony keg
★★  bottles
★★  barrel
★★  bottle
★  bottle homebrew
★  bottle beer
★  cask
★  cases of beer
★  keg
★  big green egg
★  half keg
★  full keg
  can beer
  half barrel
  canyon creek
  firkin
  green egg
  case of beer

Your alternative for keg is not listed? Suggest!
Speaking about keg, one probably shouldn't forget about kegerator.

Other search terms related to keg and their ratings are:
★★★★★ kegerator
★★★ priming sugar
★ home brew
You have in mind a companion for keg and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of keg in all years. Click on graph for more.
keg
cases
cans