This portable power bank is irreplaceable for me, and it has less to do with the capacity

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I've just completed the final 75 miles of the Camino Frances in northern Spain, walking from Sarria to the cathedral in Santiago de Compostela in six days. 

While the pilgrims of old didn't have smartphones, they are a vital part of doing the Camino in modern times, partly because you need to find and book accommodation (not to mention enter your passport details and the like -- there's a lot of bureaucracy in the modern world), and not to mention that finding shops, cafes and restaurants that are open in the winter season can be tricky.

Also: Finally, a reliable multitool for under $30 and doesn't feel like junk

So a smartphone is not a luxury, it's a vital bit of safety gear. A vital bit of safety gear that keeps you connected and needs charging ...