I have been causally searching for plastic alternative sippy cups and bottles since my first daughter was born in early 2012. Since then I have been so happy to see the options grow. With my second daughter I restarted my search for a glass sippy cup and I was SO HAPPY to find this one and discover that she loves it too! Some of the glass options out there are so heavy which didn't work for us because at 9 months she likes to hold it herself. This one is light enough for her to keep tiped at the right angle and I feel like the silicone at the bottom is thick enough that it won't break if she drops it or bangs it against something hard. We have also used the green sprout cup which worked well, but wow, that cup has too many pieces (and its heavier). This cup is much better! I am going to order a second one now in the larger size.