Normally i only use them for really thirsty plants like cukes in containers. This year i have 12 in a drip system in buckets and i will have upto 6 more in Walmart bags. I also have a couple with only coco coir/perlite in the buckets.
What do you think about drip pans or saucers? Let them run off or use something to catch a inch or two of water? Keeping pots from drying out too much doesn't seem to be a issue until late July and August. Ive never used grow bags but my gut is telling me they would benefit more if the bottom stays wet? The bags will have a coco, perlite and compost mix to try to keep them somewhat lighter than the buckets.
I was thinking about a 1.5 bushel laundry basket to catch a little water and some support for the bags. Also to help move them around a little easier if needed.