Reusable Ice Packs (2 Pack)

You can feel how dense these are the second you pick one up, and they stayed rock-hard in our lunch bags for a full six-hour drive. For a rigid pack, they actually conform to the bottle shape better than I expected, which was a pleasant surprise.

Our cooler stayed icy for a whole 10-hour drive, which was a first for us. These things are solid bricks when frozen, so they really do lock the cold in way better than the squishy kind I've used before. They slide right into the bottle bags and don't leak a drop.

These froze rock solid overnight and my drinks were still cold after a six-hour drive, even with the car sitting in the sun. The rigid shape is actually a plus—they slide right into my cooler bag without bending awkwardly.