Fabric Pots - Air circulation under pot?

[bobsakamoto]

something i have done that is much cheaper is buy the cheapest plastic pot i can find then pop the inside bottom plastic part out, and place that upside down in my tray... good drainage+air flow. in fact, the last one i did this with looked exactly like NA420 's pic up there.

if i could upload a pic i'd post it--looked for one online but they only have pics of the pot itself not the innards.

[sag]

I have my fabric pots in trays that have rocks in them to keep the pots off the bottom of the trays. The water that does drain seems to evaporate by the time the next watering comes around.