Hi Rose
Cooler bags and ice packs work well and I have used them for the past six years. However be aware not all airlines will allow you to carry the needles in the cabin, they must go in the hold. So, if your injections are pre-mixed you must make certain with the airline that they will definitely allow you to take them on board the aircraft.
We flew to Faro, Portugal, two years ago with Jet2.com. I had a letter from Healthcare at Home and other paperwork. I asked before going and was informed by their Head Office that it would be okay. Going through X-Ray at the airport I was stopped! They would not allow me to carry the Enbrel. Consequently four phials of Enbrel were left to waste at Blackpool airport and I had no injections for two weeks!
I'm very wary these days! Good luck,
Lyn x