A few years ago, we were fortunate enough to have a manufacturer that produced AEDs not much bigger than a paperback. Cardioscience, IIRC. Every one of us carried one in our specialist and physician packs, plus we had one Zoll multiparameter monitor/defibrillator that we could use to manage patients when necessary. To me, it was worth it to have that extra few pounds on my back as we're often split into squads and might need the AED if one of our folks went down (even the search K9s!). But, I'm a bit of a Clydesdale, so weight on my back for miles doesn't really cause me to complain. For some reason, the manufacturer of the sweet little AEDs stopped making them. The pads were expensive to replace, and they need replaced before they expire to make sure they will sense and deliver current properly. Replacing pads, batteries, and upkeep are often unforeseen expenses, when you don't have Uncle Sam footing the bill. Something to consider. I don't have one myself and don't feel the need to have one. A defibrillator is a one-trick pony, and I can spend that money on lots of other things that will make a difference in my trip and getting me and mine home.