I always carried a spare reusable pen when I went away overnight.Going slightly off topic here but just a comment if you change over to reusable pens. I always take 2 or 3 disposable syringes with me when on holiday, just so that if the reusable pens break or get lost (yes I've lost my pen a couple of times), I have an emergency method of getting the insulin from the cartridges into me....
I don't use a smart pen but I do use novopens 5, with the little digital screen on top.The problem with a frio pouch is you can't store a smart pen inside it because it shorts it out and then your left with just a pen and unable to use it with the app and check to see if you have had your insulin or not also on the pen because the battery has popped and it's no longer working and this is a major problem would be better if you could get a waterproof pen that way it would work still even in a frio pouch