Ice packs are cooling elements that you can easily fill yourself. So it is a handy alternative to gel packs and rigid cooling elements when you have less space available for storage. It is also a lot cheaper to ship, because the product is more compact and lighter.
The Ice packs can be filled by submerging them in water. The water mixes with the powder that is already present in the Ice packs, creating a thick cooling gel. You can then simply freeze and use the Ice packs. Because you fill and freeze the Ice packs yourself, it takes more time before you can use them compared to gel packs.