I have undertaken 8 Camino's of various lengths as an Insulin Dependent Diabetic.
The last two have been on an insulin pump.
When I read the CSJ article I was quite amazed as most of it seemed obvious, though James has done us a great service by putting it on paper. I decided that I had become blasé.
I wrote a follow up article which was publsihed in the Confraternity of Saint James Bulletin, Vol 110, June 2010, pp. 14-17, 2010. This contains some additional tips gleaned from experience.
The article is not on line but copies of the bulletin may be available via
http://www.csj.org.uk
If anyone is really interested I hold the copyright and can put it on this board, though it is a bit longer than most comments.
In 2008 one of the refugios had a note up that a local pharmacy would not issue insulin without a prescription, so just bear that in mind.
Personally, I have never used a Frio bag as Insulin is usually stable enough to carry along the Camino for a month. (There is some debate as to how long insulin kept at room tempretature can be safely used) However, any unfridgerated, unused insulin should be thrown as soon as you return home.
However, if you can get a Frio bag it sounds like a good idea, especially if you are walking in the summer. If you can't, bury the insulin in the middle of your rucksack in a container that cannot be crushed.
I am sure that all you know enough not to put insulin in a bag that is travelling in an aircraft's hold where it will freeze.