Those words can only be spoken by those lucky pilgrims whose checked bags have never been lost at the start of a camino. I know the rate of loss is very small (though it has
increased a LOT) but it is also true that every year we hear reports on the forum of someone whose bag didn’t arrive. Of course it’s not the end of the world, but the hassles and disruptions that follow are unpleasant and unnecessary. It took me a long time to get the perfect packing list, replacing it at the last minute in Spain would be impossible.
If you are bringing things that you think will cause a TSA or security problem, I would do one of two things — buy the item in Spain, or check a small tube/box with knife and whatever else you want to bring along. I have had my poles go missing, which caused a last-minute slightly frantic scramble to buy some new ones, but if it had been my pack instead of my poles in a tube, I would have been a very unhappy peregrina.