Best sippy cup - any with air vent thingy?

[MilkyChops]

My LO is great with water out of the really basic style sippy cup but is too impatient to come up for air when drinking his milk, are there any with a vent type thing to let air in like on a bottle. Or does he just need to learn to come up for air when drinking his milk?

We use the tommee tippee active ones, one sports and one sipper; they are both super non-spill (so fine on the sofa!) and have air holes for good flow (with sucking).

I've always just used the basic sippy cups. He probably needs to learn to come up for air - that's the difference between a cup and a bottle!