Koolpak is the UK's only manufacturer to ISO9001 and has been the leading brand for over 10 years. Koolpak's instant ice packs are licensed Class 2 Medical Devices and are approved by the Governments MHRA, Medicines and Healthcare products Regulatory Agency. Many instant ice packs not manufactured to our standards and are likely to burst on activation because of the poor quality of the bags. Our bags are made to a special formula of polyethylene and are produced to the highest quality standards. Each pack is checked twice and goes through strict assessments before being packaged.