Please choose the correct solution to the question: Make an ice-pack that won't drip

Solution1: Place a water saturated sponge into a freezer bag, then freeze. When the ice-pack melts, the sponge will hold the melted water and not drip.

Solution2: Place a salted sponge into a freezer bag, then freeze the bag. When the ice-pack melts, the sponge will hold the salt and not spill or drip.

Answer format: solution1/solution2
Answer: solution1