stress balls and milk dispensers just like the real things!! :O

They drink those when they're getting ready to play capture-the-nipple-flag.

i got some of those at a flea market. they are stress balls.

Those are not full of milk. I bought some of these in Japan while I was visiting and they're full of water (or some other clear liquid) and sealed close. It appears that the original photographer faked these photos to look like they dispense milk. I thought it was funny the first time I saw these since they were in a toy store though.