“My title says it all. I am a Hydrojug girlie - often purchasing them to collect all the colors on Amazon for myself. I bought these for my little girls and they were ecstatic to have a cup like mom, but I don't know if it's them or the size or what, but they often get jammed up and off track when trying to unscrew them. We've even had to already get rid of and replace one when even trying to hammer it open didn't work. I highly recommend these over other children's water bottles on the market still, but maybe take caution when opening and closing them. Especially since they do need to be fairly tight for it to be spill proof.”
