Product review (5 stars): I like these baskets.
I am using the bigger one more right now since we are using sippies.  In a few days I will also be using it for bottles too.  I like how you have options on which basket to use.  The bigger one holds quit a bit and I have 3 using sippies right now.  Not sure about the round thing.  I think you could use it for just about anything you need it to be.  I haven't had a reason to use it yet.