RIO the world's first patented cooling wallet – Simply activate with cold water!– Light and compact– Reusable All FRIO wallets have been designed with our patented crystal technology to keep your temperature sensitive medication cool and safe. The FRIO Small Wallet is perfect for a variety of different types of insulin vials or cartridges making this particular FRIO ideal for those with Diabetes not using a pen injection system. With a minimum continuous cool period of 45 hours and a recharge time of under 5 minutes, FRIO is made for your everyday – wherever that might be! Suitable for carrying the following combinations of pens, vials and cartridges: Diabetes Medication– 10 x 3 ml cartridges; or– 10 x 1.5 ml cartridges; or– 3 x 10 ml vial (bottle)* *Tip: If your looking to store 10ml vials the FRIO EXTRA SMALL would be even better for you, it also holds 3 but it is more compact!