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These bags are made out of HDPE black poly, 1 7/8" X 1 7/8 x 6.5" with a vent hole 1/2" above the bottom. They were made to my specifications, I wanted to have some that I could use with my greenhouse trays, so, now I can put 36 of these bags in each tray. Bags are gusseted. These bags will last for many years, the plastic will withstand temperatures as low as 100 F below 0. Remember, these bags are to be used above ground, never in the ground. Plastic bags are not a substitution for the cloth bags dipped in Spinout. The Spinout bags can be put in the ground while your trees grow, and be left there for a few months. The roots will not find their way through the bag for a long while, sometimes a year. Do not attempt to put the plastic bags in the ground, the roots will get through the vent hole in no time and you will not be able to dig that tree without much effort.
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Bag Opener
These bags can be stubborn when you want to open them. It is very hard to make the bottom flat. Necessity prompted to design a tool to open them. After several prototypes, I came up with this one. It's not hard to make but takes time.
In case you don't want to make that tool, you can buy it. I ship it half assembled, you have to screw in 2 screws on the bottom with a Phillips driver. Unit shipped is not painted.
Bag opener in use