I do all my seeds in solo clear plastic cups. My starters are little 5oz. cups-tomatoes & peppers go in them, as well as any herbs & flowers. Then I pot them up into 10oz, then 16 & 20oz- all clear so I can monitor root growth. I use an old woodburner tool to make 3 holes around the bottom edge- that is a winter chore! They sometimes last for more than one use- it depends how much direct sunlight they are exposed to. I find them very satisfactory, and inexpensive. To contain them, I scrounge plastic trays from garden centers- the ones that hold 3" cactus are perfect.