I've been thinking of doing this kind of thing using some old polyester double knit yardage that I've picked up for free or cheaply at estate sales. I think it should drain and hold up as well as landscape cloth. I've used it for frost blankets when I use up all the wool yardage that I also got for free.
Some of the commercially available potato grow bags have flaps with velcro to make early harvesting easier. I was wondering if those would be worth bothering with. Also considered adding external channels that could have support poles threaded through. Ling on the TXRareFruit Yahoo list suggested using an external wire cage as support for growing fruit trees in the pots when he posted the link to this page.
bevbh, Yes, I'm sure the polyester knit fabric would work! Your idea of channels is great and not a problem to sew a straight line down either side of the bags! Since the knits don't ravel much, you could just cut a couple holes (one at the top another at the bottom of each side) to thread the poles through, too. The Totes do support each other if grouped together, but I'd feel better with supports for single Totes.
The Velcro sounds good too, but may not be necessary. The bags are pliable and easy to rob from!
I would think I a couple of poles would be better for fruit trees grown in fabric pots than the wire cages. Cages sometimes need support themselves.
Thank you so much for reading and posting your excellent suggestions,