Glucology X-Large Cooling Wallet holds: - 5 x insulin injection pens either per-filled disposable pens or refillable pens, or - 15 x 3ml or 1.5ml cartridges; or - 6 x 10ml vials of insulin and syringes. Glucology insulin cooling pouches: - Keep insulin cool for up to 36 hours per activation - Activate simply by immersing in cold water - Light and compact, prefect for travel - Reusable activate again and again.