hmmm, good question but I think since they state no glass containers allowed that they wouldn't be. Gerber does sell their baby food in plastic containers, you could take those instead.
I never had a problem taking glass baby food containers in the park. In fact the baby food sold at Disney (last time I bought it there) was glass. Maybe now that there are plastic options it is different but still many foods are only sold in glass so I don't think it is a problem.
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