Our son has recently discovered juice.  Active toddler that he is, I spend my time chasing him around while he squeezes the boxes or bags shooting juice all over himself and everything in sight.  Enter One Step Ahead's Juice Pal.  Nicely insulated, it provides handles to hold and stops the squeezing.  One recommendation...  if you are using a juice bag or pouch, stuff it in the Juice Pal before putting the straw in to avoid being the messy culprit yourself.