We ordered these to replace bulky heavy ice packs that were many years old. As they are slim in dimensions 16.5cm x 11cm x 1.5cm they slot into a cool bag inbetween or down the side of items ensuring the whole bag contents stay cold. They are well made and easy to wipe clean. We’re happy with the product but feel they are currently a bit overpriced at nearly £9 for a set of 4. If the price came down a bit we’d happily recommend them.