So my in-laws will be watching Xander (will be 5 months) for a weekend (Friday - Sunday). He's currently EBF, so I know I'll have to provide them with breast milk to feed him. He takes about 30 oz a day, so I know I'm going to have to dip into my freezer stash to supply them with enough milk to get through the weekend.

My question is, how do I get my frozen milk to them without it thawing? They live about 1.5 hours from us.