It looks like the coke kegs are the shorter ones. Probably not a big deal for most people, but for me, the 22" (or even 23" with everything attached) simply fit a lot more easily in my dispensors. I have a commercial refrigerator that I converted into a six-tap kegerator and it is only about 3' high. The short kegs fit much more easily inside it. I guess I'm going to look for coke kegs and then convert them from pin to ball lock after I get them in. This adds about $10 to the cost of each keg, but it is worth it for me.