Minuscule and ineffective.
These cold packs weigh 2.7 ounces (74 grams). Some of my hens lay bigger eggs! I had no idea they even made them so small.
Same size as a lunch bag ice pack. Completely melted and warm by the time it arrived - what's the point? I thought maybe it'd be dry ice or something. My guess would be it was completely melted within 12 hours. What a waste!