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The shape fits flush in my cooler cup, so it takes up almost no space while keeping milk cold overnight at work. It's the backup I didn't know I needed, and it works for both bottle sizes I rotate through.

I’m a bit paranoid about milk temp on long shifts, but this ice pack slides right into my 16 oz cooler and keeps bottles cold for the full 24 hours. Even after thawing a bag mid-day, the pack still felt icy. This backup has saved me more than once.

Left it in the fridge overnight, then dropped it into the cooling cup before my shift—milk was still properly cold when I got home 22 hours later. The contoured fit means no awkward bulging in my 25 oz cooler, which honestly surprised me for such a slim pack.