This cup saved me with my twins, first as infants using the rounded spout, and now as toddlers using the straw. They had to sit upright to eat and had no problem with this cup - they even learned to self-feed around 5 months using the handles. Now they love their straw cups and these things do not leak. Like every other straw cup a little water (like a few drops) might come off when they drop the cup but it’s so minimal. We use different straw cups now for milk as they only have milk at the table, but even before that these were easy to use and easy to clean. Some other cups with weighted straws cannot be easily cleaned and milk or water gets stuck inside the straw, but I have never had that issue with these, thank god. Do yourself a favor and just buy one.

highly recommend this cup, so better than anything we had in the 80's , durable and so practical, cover for straw fantastic, weighted straw meant that water always available for bub,

This doesnt leak at all and is a great sippy cup! Video showing Im shaking it upside down over my couch and no leaking what so ever ?? great sippy cup, nice packaging, my 1 year old loves it, I live the design of it, and it doesnt leak his favorite drink (tea) ,

Best quality. It does not lose water and is very comfortable, capacious and usable from 6 months to over 12. I recommend it. Amazon always flawless.

Overall worth it for money, solid high quality plastics. Gasket was loose in box, didn't see it and at first the cup leaked (included photo of installed gasket). Once I installed the gasket, cup is leak proof. My 11 month old is able to lift it with both hands.
Pros:
Doesn't leak once gasket in place
Cute
Weighted straw
Comes with spare straw
Measuring markings
Convertible to non-straw sippy.
Handy sliding lid