It doesn’t matter if I go away for a day or a month; I pretty much always carry the same two bags. One of the bags has all of my electrical gadgets and chargers, and one of the items in that bag—which I don’t think I’ve ever mentioned—is a triple cube grounding adapter. It’s small and allows me to expand outlet capacities when I’m traveling since the cube allows users to plug three devices into a single outlet. That’s key since a lot of (older) hotels only have a couple of outlets, which isn’t enough to keep my devices charged. The adapter is for indoor use only. The Leviton 692-W 15 Amp 125 Volt costs $5.36 on Amazon.
