I've thought of several variants of how to secure these. The one closest to the above is to use a piece of nylon rope -- probably 3/16" around the perimeter and put a loop at both ends. That should only require 1 zip-tie to tighten the rope around the EB. Nylon is rot and UV resistant, so it should last a long time. (But if buying rope for this, make sure it is not just "Poly" and also does say UV resistant.)
Since I put tomato cages in the EB's and lash the cages to the wooden stand they sit on for stability, I might not even have to use an additional securing line. The cages go through the plastic in at least 8 spots (2 cages/box), and that should hold the covers in place. I'll try a couple of methods next spring and see what looks easiest/best.
-GG
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