[Perfect Size]: Our ice pack measures 3.5*7 inches (9*19 cm), making it a compact and convenient travel companion. This convenient size is ideal for most portable insulin travel coolers to help keep your diabetes supplies cool and in good condition while on the go. [Advanced Cooling Technology]: We provide 2 colloidal ice packs (2*120 grams, TSA permitted), the internal water content of the colloidal ice is 50%, which provides a longer-lasting cooling effect and keeps your insulin and other medications at the right temperature. [Durable, leak-proof Design]: Our ice packs are constructed with an abrasion-resistant nylon fabric and PVC material on the outside that resists scratches and breakage, and the PVC material has excellent waterproofing properties that minimize the risk of leakage of liquids, so that the ice packs remain intact, even in harsh travel conditions. [Effective Temperature Retention]:Once frozen for 8-12 hours and placed in a freezer bag, our ice packs maintain a temperature range of 35.6-46.4°F for 4-6 hours at temperatures below 86°F. Holds temperatures below 74°F for over 12 hours without the need for an additional power source, keeping your medications safe and effective. [How to Use]: Simply freeze the ice packs for 8-12 hours and place them in the cartridge for a long-lasting cooling effect. These ice packs are reusable for 3-5 years and can be stored in the refrigerator when not in use.NOTE:For Smooth TSA Screening,Please ensure your ice pack is COMPLETELY FROZEN before going through security. Ice Packs for Insulin Cooler Travel Case, Pack of 2（120g *2) , TSA Approved Reusable Cooler Ice Packs，Highly efficient heat retention for 8-24 hours，Suitable for Most Medication Cooler Travel Case