I use 288 cell trays. The cells are 3/4" X 3/4" X 1 1/2" deep. They work great for dwarfs and micros - a little cramped for full-size indeterminates - but OK if you pot them up early enough.
Like some earlier said - you know exactly how many plants you have to pick from - and it is easy to keep track of what is in which row.
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