You can grow large indet. tomatoes in 5 gallon containers or even less (I use 12l) at least when pruned down to 1-2 stems. But it is very important to water and fertilize them properly and at least during the hot summer weeks you probably need to water them twice a day.
You'll need a really balanced fertilizer suitable for tomatoes, not one that only contains N-P-K, or you'll get some micronutrient deficiencies.
Don't chose varieties that are prone to get BER or you'll end up very frustrated...
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