I will try to remember about this. I am very curious as to the level of success with your 1 gal size containers. I am always experimenting with ideal size containers for beans. And while bigger pots are always better, space and convenience need to be considered! So there is a need to discover what is the smallest possible size while still being spacious enough so that the roots do not overcrowd.
At first I thought your gallon jugs were much too big but long beans are pole-type beans, aren't they‽ More foliage needs more water which need more roots.
🍀
!LUV