Tommee Tippee Sip 'n' Seal Cup
I have used these cups for my son since he first started with a sippy cup, and they are great! Good handles for him to hold onto, and really easy to drink from! Easy to clean aswell!
The only downside is they are not good for milk, as the milk tends to get stuck in the nozzle and is hard to properly clean out!!
Once you close the lid, mine have never leaked!