Pepe where do you get the ones with velcro?
Here are a few photos and a side by side comparison with two Violet de Bordeaux Fig Trees in 7 gal containers.
The one on the left is in a plastic pot and the other in a fabric pot with velcro side. Both trees started from 1 gal trees about one year old. They both had the same soil mix (Heavy Perlite in peat and wood chips etc.) Both have Florikan 13-13-13 in the soil.
The fig in the fabric bag is taller by about six inches and the caliper is about twice as thick.
I was actually surprised to see the results because figs like being root bound according to all the info posted and generally accepted as fact.
When using fabric be sure to place the fabric container on a hard surface or the tap root will work into the soil. Side roots are air pruned and your trees love it. So far it looks like the trees can stay in the fabric bags much longer than in a hard surface container.
Roots stay cooler also. For more info:
http://www.pepsplants.com PS. I can pick up the fig by the trunk in the fabric bag and it is well rooted even though the picture does not show it to be well rooted.