Very disappointed. I thought that this coolers were going to stay cooler longer because of the gel but it really doesn’t make a difference with the ones that are filled with water. This ones melt within a few hours inside of an insulated lunch bag. Also the yellow one bursted with it first use. I did check if it was water and definitely is gel. The colors are not as bright as the picture shows. Honestly I do not recommend this coolers for the price!