These have become my go to cups for on the go! 
I like that they can snap all the way down an seal tight to not leak and when in the car you can not snap all the way tight and just snap it shut for easy opening, and it is still closed.
They are insulated, which keeps my drinks cold...
The only thing is, don’t tighten the lid too tight or you will have trouble getting it off and it will be a two person job!!  Only did that once...
I am getting rid of all my other tumblers I have collected over the years for taking on the go since I found these, that is how much I love them.