Frio Cooling Wallet, Small, Black

External Dimensions: 5" x 6" Weight: 1.6 oz • Suitable for carrying: • Suitable for carrying 10 x 3ml refill cartridges - OR - • 15 x 1ml refill cartridges - OR - • 3 x 10 ml insulin vials - OR - • 2 x Innolet Injectors • 3 x Eye-drop containers • a combination of the above If you want to carry a vial and some syringes so they are all in the same convenient place, then please order the FRIO2 or the FRIO5 Inner Wallet Dimensions: 140mm x 150mm (5.5" x 6"approx) Do you need a waterproof liner? Waterproof liners are recommended for any one who is using anything electronic, such as the pump and Innolet injector and meters etc to prevent any moisture effecting them. It can also be used to help prevent any labels coming off the bottles if required. The manufacturers of Byetta also suggest that moisture stay off of their pens, so, Byetta users may benefit from the waterproof iners as well. If you have questions about whether or not you need a liner, please let us know. We will be happy to assist you.