No-spill cups for big kids

We've had these cups for awhile now and I can honestly say they are no-spill.  The only time I had any trouble with them was when I didn't get the top screwed on correctly in the 1st place.  You can put them in a backpack, purse, or just throw them in the car and you don't have to worry.  At 1st glance, they look like a sippy cup, but they are targeted to 4-8 year olds.  In fact, when we first got them, my 3 year old could barely push the button to make her drink come out.  The cups are made by Contigo. We found them at Costco in a 4 pack for around $20 (I think).  I've seen them there recently.  They come in both boy and girl colors.