Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Looked like a good idea...

I think the general idea of these is great. For the first 2 minutes, I thought we had a winner...then my 18 month old pulled off the lid with his teeth, and his snack was all over the floor. If they came with screw-on lids, then I think they'd be perfect...as is, they are useless to me.