Hey E. Any questions are welcome. I hope i have the answer to most. The bags I use are biodegradable. I'm just now testing out how long the bags will last in the ground. I'm also testing how they will do in the Mississippi clay soil. I planted about 10 seedlings this pass weekend in the small white grow bags. I planted about 15-20 seedlings last year (not in grow bags) and the majority is still alive with out much growth. The small bags stand well on their own with the proper size tree in it. I still keep them in a normal size tray with drainage holes for organization. The high wall tray sound great for a larger tree in a smaller bag. Same for the concept for the larger trees. I haven't had a problem with any of them flopping over yet. So direct sun, the only problem I have with it is they need to watered more frequent. I have also been thinking about playing with the soil mix for those trees. Making a more water retaining mix due to the evaporation. The material seem to hold together well without any break down for the 3 years I've been using them (larger black bags). This is my first year using the small white bags and there are a wide range of sizes. I like to use these for the small bags, no certain brand. I also use 3g, 5g, 7g, and the biggest one is 15g. The larger bags are wider than tall. I'm guessing it's for stability, which I like. I haven't experimented with them over wintering in the open elements without protect. I mostly jam pack as many trees as I can in the greenhouses. The few that I put in the 15g bags this year will stay out. They will be insulated with leaves and wood chips as I've always done with the plastic pots.