Consider putting the potatoes in the ground. it will make your life easier in 2 ways. the first is that they are a great soil cleaner and the second is that in containers you will be watering them every day no matter how much rain you may or may not have had because they need a lot of water and their foliage naturally creates an umbrella effect prevent water from getting into the container and containers are notorious for drying out. beans are another that require a lot of water and don't fair well in containers sadly. that can easily be dealt with with an old trick to line the ground a spade or ideally 2 deep with either compacted grass clippings or old newspaper which acts to hold water in. roots can penetrate as needed so it's not a swimming pool effect causing stagnant water to build up.
Tomatoes are good for containers, as are herbs such as thyme, oregano, and a small plant of parsley (needs watering so single plant dwarfed by container initially). it doesn't matter that they won't survive winter etc though thyme is surprisingly hardy and may surprise you).