Our favorite

Sippy cups are these little Nalgene beauties. We love them because...
1. ) The nalgene brand and what it means... these babies are pretty much indestructible. I have heard stories of these surviving the toss from a moving vehicle. We have yet to try this one. But it survived (and remained closed and not leaking) a fall from the counter to the hard tile floor with bouncing. And it survived multiple rounds of the dropping game- a toddler fave.
2.) The leak-proof factor. Okay, so basically all sippy cups call themselves "leak-proof" but these actually do a decent job of it. Maybe not grape juice on a wedding day leak-proof but definitely wander through the house or take a drink to bed worthy.
3.) The fun colors. Caitlin gets pink and blue and Audge gets the purples and greens.
4.) The size. At 12 ounces you are not constantly refiling.

What we have learned. Perhaps the only down side. After a while the valves need replacing to keep the leak-proof value up. But even without a new valve, these work better than the Nuby brand (our previous go-to brand).