I was looking, I mean I am still looking for a cup or thermos with an easy opening for the nursery. It is important for me that the child can open it by themselves. We have had one for a month and a half. At first, she could open it by herself, but now it has become very tight (from washing??) and even I have to use force to open the mouth and release the straw. We recently bought a thermos bottle called ecolife. It has an easy opening (a button), but it broke at the top plastic part with the first drop. I am still looking for a durable thermos with an easy opening for a toddler.