Interesting Growlers

While surfing the web, I found a link for a Growler with a CO2 cartridge. This impressed me since the beer can come out the same way as a big keg does. On this unit the CO2 cartridge is installed in the cap.

I also liked this one, Go Keg Original 64 Oz Starter-Stainless Steel Mini Keg Growler With CO2 Professional Tap, 

Also from Go Keg is this model - Go Keg Flex Tap 64oz Starter-Stainless Steel Mini Keg Growler With CO2 Plastic Flex Tap.