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I have flown Ryanair and Iberia express both with an Osprey 40l Farpoint, which is advertised as complying with the restrictions for cabin baggage. I've never measured it and never been asked. The fact it's on my back probably means it avoids scrutiny 😉
I've only just walked Seville to Monesterio so far, but it passes through some quite uninhabited parts. There was signal most of the time - at least some. And as someone else said, even if your network has no coverage, dialling the emergency number can access any network.
The bigger problems...
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