i love the airpots ! if you can get them , its worth it .! I used geo pots last time (smiliar to smart pots), they were alright but i wanted to get into airpots and found a guy selling them used at half price. ! These are 2.7 liter pots (just under 3gal) brand new they cost about 6.00 , i got 50 of them for a half O of sour D !. (which i got for cheap) !
the thing I didnt' like about smart pots and geo pots is that they sit on the ground. When you water that moisture is almost "trapped" between the pot and the ground. With these airpots, the pot itself is elevated off the ground about 1/4 inch leaving airflow underneath your pot. That was 1 thing i really liked about the air pot. I will def. use these forever !