50 count of the 24 oz Fabri-Cal clear culturing cup we use for our cultures. These are the relatively durable cups, not the flimsy ones that burst when you press the lid onto them!  Note…this is the cup only, lids sold seperately!

We’ve used the 32 oz for years with no issues but in an attempt to save space for shipping, we’ve transitioned to the 24 oz cups for culturing our melanogaster flies.  There is not a great deal of difference between culturing Drosophila melanogaster with the two different cups, but obviously the 24 oz take up a little less space.  However I think the 32oz are preferable for culturing hydei, for a variety of reasons, so if you are culturing hydei, I’d recommend the 32oz cups.