I bought the cup Adapter a few months ago so that I could have a machine washable container.  I have much less waste using the cup adapter.  The cups are very sturdy and leakproof and clean up nicely in the dishwasher. My main problems are the noise & the design is not very intuitive. Everyone in the family has at least had at least one major mess using this product.  You must read the instructions before using or you have a mess on your hands.