This is the best ice pack I have used for my milk. I work 12 hours and sometimes forget to put the milk in the fridge when I get home. The milk is still cold in the morning and I have not lost any milk compared to leaving on the counter all night, which I have done too. Yes one of my 6 ice packs leaked. SW informed me the contents are not toxic and safe. The blue stain came out with Medela wet wipes. They replaced my ice pack for free and they paid for shipping. Thanks for the great customer service.